Article
Astronomy & Astrophysics
V Ripepi, G. Catanzaro, R. Molinaro, M. Gatto, G. De Somma, M. Marconi, M. Romaniello, S. Leccia, I Musella, E. Trentin, G. Clementini, V Testa, F. Cusano, J. Storm
Summary: Classical Cepheids are crucial for the extragalactic distance scale, with their period-luminosity and period-Wesenheit relations showing dependency on metallicity. This metallicity dependence significantly affects the intercept of the PLZ/PWZ relations, indicating a larger impact than previously thought. However, it remains inconclusive whether the slope of these relationships also depends on metallicity. The correction of Gaia parallaxes' zero-point offset reduces the size of metallicity dependence on the PLZ/PWZ relations.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
V. Ripepi, G. Catanzaro, L. Molnar, E. Plachy, M. Marconi, G. Clementini, R. Molinaro, G. De Somma, S. Leccia, S. Mancino, I. Musella, F. Cusano, V. Testa
Summary: Classical Cepheids like Polaris and HD344787 are likely at their first crossing of the instability strip, with similar metal abundance Z=0.008. Differences in their properties during the main-sequence phase may explain variations seen in the Hertzsprung-Russell diagram.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
Ilaria Musella, Marcella Marconi, Roberto Molinaro, Giuliana Fiorentino, Vincenzo Ripepi, Giulia De Somma, Maria Ida Moretti
Summary: ULPs are hypothesized as extensions of Classical Cepheids with longer periods, higher masses, and luminosities. They have potential as standard candles for cosmological measurements, but more data and theoretical support are needed for conclusive results.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
R. Molinaro, V. Ripepi, M. Marconi, M. Romaniello, G. Catanzaro, F. Cusano, G. De Somma, I. Musella, J. Storm, E. Trentin
Summary: Classical Cepheids are important for measuring distances in galaxies. The Gaia mission provides accurate parallaxes to calibrate these measurements. This study uses an implicit method to determine the zero point correction for Gaia parallaxes, finding a value of -22 +/- 4 mu as, in agreement with previous literature.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
G. Csoernyei, L. Szabados, L. Molnar, B. Cseh, N. Egei, Cs Kalup, V Kecskemethy, R. Koenyves-Toth, K. Sarneczky, R. Szakats
Summary: Investigating the period changes of classical Cepheids through the framework of O - C diagrams provides insights into their evolution and nature. This study presents new or extended O - C diagrams for 148 Galactic classical Cepheids, and finds observational indications of period change rate dependence on the horizontal position within the instability strip. Period fluctuations are observed in 59 Cepheids, which are uniformly distributed over the inspected period range. The fluctuation amplitude is found to be dependent on the pulsation period, similar to longer period pulsating variable stars.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
E. Trentin, V Ripepi, G. Catanzaro, J. Storm, M. Marconi, G. De Somma, V Testa, I Musella
Summary: This article examines the faintest classical Cepheids in the Milky Way, deriving atmospheric parameters, radial velocities, and abundances for each star. By comparing the data with previous studies, the authors find a metallicity gradient in the Galactic disc and a possible break in the gradient at R-GC = 9.25 kpc.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
N. Nardetto, W. Gieren, J. Storm, V. Hocde, G. Pietrzynski, P. Kervella, A. Merand, A. Gallenne, D. Graczyk, B. Pilecki, E. Poretti, M. Rainer, B. Zgirski, P. Wielgorski, G. Hajdu, M. Gorski, P. Karczmarek, W. Narloch, M. Taormina
Summary: This study quantifies the impact of the surface-brightness color relation (SBCR) on the Baade-Wesselink (BW) projection factor used in distance determination of Cepheids. By analyzing different SBCRs in the literature, it is found that the choice of SBCR has a significant effect on the projection factor, with a scatter of about 8%. Extinction and circumstellar environment have less impact on the projection factor. Efforts should be made to improve the empirical and theoretical SBCR of Cepheids, taking their circumstellar environment into account.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
Jason L. Sanders
Summary: Gaia DR3 parallaxes are used to calibrate preliminary period-luminosity relations of O-rich Mira variables. The derived relations are compared to those measured for different celestial objects. Models of the Gaia astrometry for the Mira variables suggest that the recovered parallaxes should be unbiased but with underestimated uncertainties for the nearest stars. The derived period-luminosity relations are used to find the Hubble constant for the Type Ia host galaxy NGC 1559.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
E. S. G. de Almeida, M. Hugbart, A. Domiciano de Souza, J-P Rivet, F. Vakili, A. Siciak, G. Labeyrie, O. Garde, N. Matthews, O. Lai, D. Vernet, R. Kaiser, W. Guerin
Summary: This paper reports on spatial intensity interferometry measurements of two stars, P Cygni and Rigel, using an upgraded experimental setup and radiative transfer models. The study successfully determined the distances of these stars and found agreement with previous measurements. This research is significant for extending the application of the Wind Momentum Luminosity Relation method for distance calibration.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Richard Anderson
Summary: This study estimates relativistic corrections for cosmic distance estimates based on stellar standard candles to achieve an unbiased 1% measurement of Hubble's constant in the future. The results suggest that all stellar standard candle observations require relativistic corrections for accurate distance measurements.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Vincenzo Ripepi, Laurent Chemin, Roberto Molinaro, Maria-Rosa L. Cioni, Kenji Bekki, Gisella Clementini, Richard de Grijs, Giulia De Somma, Dalal El Youssoufi, Leo Girardi, Martin A. T. Groenewegen, Valentin Ivanov, Marcella Marconi, Paul J. McMillan, Jacco Th van Loon
Summary: We analyzed the Y, J, and K-s light curves of delta Cepheid stars (DCEPs) in the Large Magellanic Cloud (LMC) using the VISTA near-infrared YJK(s) survey. We found a break in the period-luminosity and period-Wesenheit PW relationships for 1O DCEPs at P = 0.58 d. By calculating the individual distances of DCEPs in the LMC, we determined the position angle and inclination of the galaxy. Additionally, we observed non-planar distribution and a flared, thick disc structure in the LMC.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
M. E. Ridder, C. O. Heinke, G. R. Sivakoff, A. K. Hughes
Summary: We report two new radio detections of cataclysmic variables (CVs) and compare them with other CVs detected by radio and X-ray. The radio luminosities of these systems are unexpectedly high and their origin remains a puzzle. The radio emission mechanism for these CVs may be electron-cyclotron maser emission, synchrotron radiation, or a more exotic process. The locations of these CVs in the radio-X-ray luminosity plane suggest additional complexity in classifying unknown systems based on their radio and X-ray luminosities alone.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
G. Csoernyei, R. I. Anderson, C. Vogl, S. Taubenberger, S. Blondin, B. Leibundgut, W. Hillebrandt
Summary: This study estimates the distance to the Whirlpool galaxy, M 51, using two independent methods: Cepheid variables and the expanding photosphere method. The resulting distance estimates are 7.59 Mpc and 7.34 Mpc respectively, which are more precise than previous estimates. This finding highlights the importance of direct cross-checks between independent distance estimates.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
V. V. Bobylev, A. T. Bajkova, A. S. Rastorguev, M. Zabolotskikh
Summary: This passage discusses constructing the rotation curve of the Galaxy using data on classical Cepheids, as well as analyzing the velocities of young and old Cepheids to determine the parameters of the spiral density wave. Spectral analysis reveals the ranges of parameters for the spiral density wave, with significant differences observed between young and old Cepheids. Integrating the orbits of old Cepheids backward in time allows for more reliable values of the spiral density wave parameters to be determined.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
J. A. Barron, G. A. Wade, N. R. Evans, C. P. Folsom, H. R. Neilson
Summary: We report the detection of Zeeman signatures in four classical Cepheids using high-resolution spectropolarimetric observations. This discovery provides important information about the magnetic properties of classical Cepheids.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
G. Fritz Benedict, Thomas G. Barnes, Nancy R. Evans, William D. Cochran, Richard Anderson, Barbara E. McArthur, Thomas E. Harrison
Summary: In this study, the orbital motion of Cepheid eta Aql B is determined by analyzing radial velocity measurements from eight sources. The astrometry data is reanalyzed and compared to Gaia EDR3 and the Benedict 2007 Leavitt Law. The possible periods and mass for eta Aql B are estimated based on some observed phenomena. The lack of radial velocity variation in eta Aql B is explained by combining the photometric variation of the Cepheid with the motion of the photocenter.
ASTRONOMICAL JOURNAL
(2022)
Article
Astronomy & Astrophysics
Robert Klement, Gail H. Schaefer, Douglas R. Gies, Luqian Wang, Dietrich Baade, Thomas Rivinius, Alexandre Gallenne, Alex C. Carciofi, John D. Monnier, Antoine Merand, Narsireddy Anugu, Stefan Kraus, Claire L. Davies, Cyprien Lanthermann, Tyler Gardner, Peter Wysocki, Jacob Ennis, Aaron Labdon, Benjamin R. Setterholm, Jean-Baptiste Le Bouquin
Summary: This study presents direct interferometric detections of the sdO companions of three Be stars and reveals first orbits and preliminary dynamical masses for two of the three Be+sdO systems. These results provide new fundamental parameters crucial for establishing the evolutionary status and origin of Be stars.
ASTROPHYSICAL JOURNAL
(2022)
Article
Astronomy & Astrophysics
Piotr Wielgorski, Grzegorz Pietrzynski, Bogumil Pilecki, Wolfgang Gieren, Bartlomiej Zgirski, Marek Gorski, Gergely Hajdu, Weronika Narloch, Paulina Karczmarek, Radoslaw Smolec, Pierre Kervella, Jesper Storm, Alexandre Gallenne, Louise Breuval, Megan Lewis, Mikolaj Kaluszynski, Dariusz Graczyk, Wojciech Pych, Ksenia Suchomska, Monica Taormina, Gonzalo Rojas Garcia, Aleksandra Kotek, Rolf Chini, Francisco Pozo Nunez, Sadegh Noroozi, Catalina Sobrino Figaredo, Martin Haas, Klaus Hodapp, Przemyslaw Mikolajczyk, Krzysztof Kotysz, Dawid Mozdzierski, Piotr Kolaczek-Szymanski
Summary: This study presents the period-luminosity relations (PLRs) of type II Cepheids in the near-infrared regime, using time-series photometry and Gaia parallaxes. The study finds that BL Herculis stars have narrow PLRs, making them potential precision distance indicators. By recalibrating PLRs using archival photometry, accurate distances, and metallicity effects, the study determines the distance modulus of the Large Magellanic Cloud and its metallicity effect.
ASTROPHYSICAL JOURNAL
(2022)
Review
Astronomy & Astrophysics
Elcio Abdalla, Guillermo Franco Abellan, Amin Aboubrahim, Adriano Agnello, Ozgur Akarsu, Yashar Akrami, George Alestas, Daniel Aloni, Luca Amendola, Luis A. Anchordoqui, Richard I. Anderson, Nikki Arendse, Marika Asgari, Mario Ballardini, Vernon Bargerx, Spyros Basilakos, Ronaldo C. Batista, Elia S. Battistelli, Richard Battye, Micol Benetti, David Benisty, Asher Berlin, Paolo de Bernardis, Emanuele Berti, Bohdan Bidenko, Simon Birrer, John P. Blakeslee, Kimberly K. Boddy, Clecio R. Bom, Alexander Bonilla, Nicola Borghi, Francois R. Bouchet, Matteo Braglia, Thomas Buchert, Elizabeth Buckley-Geer, Erminia Calabrese, Robert R. Caldwell, David Camarena, Salvatore Capozziello, Stefano Casertano, Angela Chen, Geoff C-F Chen, Hsin-Yu Chen, Jens Chluba, Anton Chudaykin, Michele Cicoli, Craig J. Copi, Fred Courbin, Francis-Yan Cyr-Racine, Bozena Czerny, Maria Dainotti, Guido D'Amico, Anne-Christine Davis, Javier de Cruz Perez, Jaume de Haro, Jacques Delabrouille, Peter B. Denton, Suhail Dhawan, Keith R. Dienes, Eleonora Di Valentino, Pu Du, Dominique Eckert, Celia Escamilla-Rivera, Agnes Ferte, Fabio Finelli, Pablo Fosalba, Wendy L. Freedman, Noemi Frusciante, Enrique Gaztanaga, William Giare, Elena Giusarma, Adria Gomez-Valent, Will Handley, Ian Harrison, Luke Hart, Dhiraj Kumar Hazra, Alan Heavens, Asta Heinesen, Hendrik Hildebrandt, J. Colin Hill, Natalie B. Hogg, Daniel E. Holz, Deanna C. Hooper, Nikoo Hosseininejad, Dragan Huterer, Mustapha Ishak, Mikhail M. Ivanov, Andrew H. Jaffe, In Sung Jang, Karsten Jedamzik, Raul Jimenez, Melissa Joseph, Shahab Joudaki, Marc Kamionkowski, Tanvi Karwal, Lavrentios Kazantzidis, Ryan E. Keeley, Michael Klasen, Eiichiro Komatsu, Leon V. E. Koopmans, Suresh Kumar, Luca Lamagna, Ruth Lazkoz Dn, Chung-Chi Lee, Julien Lesgourgues, Jackson Levi Said, Tiffany R. Lewis, Benjamin L'Huillier, Matteo Lucca, Roy Maartens, Lucas M. Macri, Danny Marfatia, Valerio Marra, Carlos J. A. P. Martins, Silvia Masi, Sabino Matarrese, Arindam Mazumdar, Alessandro Melchiorri, Olga Mena, Laura Mersini-Houghton, James Mertens, Dinko Milakovic, Yuto Minami, Vivian Miranda, Cristian Moreno-Pulido, Michele Moresco, David F. Mota, Emil Mottola, Simone Mozzon, Jessica Muir, Ankan Mukherjee, Suvodip Mukherjee, Pavel Naselsky, Pran Nath, Savvas Nesseris, Florian Niedermann, Alessio Notari, Rafael C. Nunes, Eoin O. Colgain, Kayla A. Owens, Emre Ozulker, Francesco Pace, Andronikos Paliathanasis, Antonella Palmese, Supriya Pan, Daniela Paoletti, Santiago E. Perez Bergliaffa, Leandros Perivolaropoulos, Dominic W. Pesce, Valeria Pettorino, Oliver H. E. Philcox, Levon Pogosian, Vivian Poulin, Gaspard Poulot, Marco Raveri, Mark J. Reid, Fabrizio Renzi, Adam G. Riess, Vivian Sabla, Paolo Salucci, Vincenzo Salzano, Emmanuel N. Saridakis, Bangalore S. Sathyaprakash, Martin Schmaltz, Nils Schoneberg, Dan Scolnic, Anjan A. Sen, Neelima Sehgal, Arman Shafieloo, M. M. Sheikh-Jabbari, Joseph Silk, Alessandra Silvestri, Foteini Skaraj, Martin S. Sloth, Marcelle Soares-Santos, Joan Sola Peracaula, Yu-Yang Songsheng, Jorge F. Soriano, Denitsa Staicova, Glenn D. Starkman, Istvan Szapudi, Elsa M. Teixeira, Brooks Thomas, Tommaso Treu, Emery Trott, Carsten van de Ruck, J. Alberto Vazquez, Licia Verde, Luca Visinelli, Deng Wang, Jian-Min Wang, Shao-Jiang Wang, Richard Watkins, Scott Watson, John K. Webb, Neal Weiner, Amanda Weltman, Samuel J. Witte, Radoslaw Wojtak, Anil Kumar Yadav, Weiqiang Yang, Gong-Bo Zhao, Miguel Zumalacarregui
Summary: The paper discusses the limitations of the standard Lambda Cold Dark Matter (Lambda CDM) cosmological model and proposes new physics models to alleviate the tensions in various cosmological measurements. The authors emphasize the importance of considering a wide range of data and discuss the significance of upcoming experiments and space missions in addressing open questions in cosmology.
JOURNAL OF HIGH ENERGY ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
A. Vallenari, A. G. A. Brown, T. Prusti, J. H. J. de Bruijne, F. Arenou, C. Babusiaux, M. Biermann, O. L. Creevey, C. Ducourant, D. W. Evans, L. Eyer, R. Guerra, A. Hutton, C. Jordi, S. A. Klioner, U. L. Lammers, L. Lindegren, X. Luri, F. Mignard, C. Panem, D. Pourbaix, S. Randich, P. Sartoretti, C. Soubiran, P. Tanga, N. A. Walton, C. A. L. Bailer-Jones, U. Bastian, R. Drimmel, F. Jansen, D. Katz, M. G. Lattanzi, F. vanLeeuwen, J. Bakker, C. Cacciari, J. Castaneda, F. De Angeli, C. Fabricius, M. Fouesneau, Y. Fremat, L. Galluccio, A. Guerrier, U. Heiter, E. Masana, R. Messineo, N. Mowlavi, C. Nicolas, K. Nienartowicz, F. Pailler, P. Panuzzo, F. Riclet, W. Roux, G. M. Seabroke, R. Sordo, F. Thevenin, G. Gracia-Abril, J. Portell, D. Teyssier, M. Altmann, R. Andrae, M. Audard, I. Bellas-Velidis, K. Benson, J. Berthier, R. Blomme, P. W. Burgess, D. Busonero, G. Busso, H. Canovas, B. Carry, A. Cellino, N. Cheek, G. Clementini, Y. Damerdji, M. Davidson, P. Deteodoro, M. Nunez Campos, L. Delchambre, A. Dell'Oro, P. Esquej, J. Fernandez-Hernandez, E. Fraile, D. Garabato, P. Garcia-Lario, E. Gosset, R. Haigron, J. -L. Halbwachs, N. C. Hambly, D. L. Harrison, J. Hernandez, D. Hestroffer, S. T. Hodgkin, B. Holl, K. Janssen, G. Jevardat deFombelle, S. Jordan, A. Krone-Martins, A. C. Lanzafame, W. Loeffler, O. Marchal, P. M. Marrese, A. Moitinho, K. Muinonen, P. Osborne, E. Pancino, T. Pauwels, A. Recio-Blanco, C. Reyle, M. Riello, L. Rimoldini, T. Roegiers, J. Rybizki, L. M. Sarro, C. Siopis, M. Smith, A. Sozzetti, E. Utrilla, M. vanLeeuwen, U. Abbas, P. Abraham, A. Abreu Aramburu, C. Aerts, J. J. Aguado, M. Ajaj, F. Aldea-Montero, G. Altavilla, M. A. Alvarez, J. Alves, F. Anders, R. I. Anderson, E. Anglada Varela, T. Antoja, D. Baines, S. G. Baker, L. Balaguer-Nunez, E. Balbinot, Z. Balog, C. Barache, D. Barbato, M. Barros, M. A. Barstow, S. Bartolome, J. -L. Bassilana, N. Bauchet, U. Becciani, M. Bellazzini, A. Berihuete, M. Bernet, S. Bertone, L. Bianchi, A. Binnenfeld, S. Blanco-Cuaresma, A. Blazere, T. Boch, A. Bombrun, D. Bossini, S. Bouquillon, A. Bragaglia, L. Bramante, E. Breedt, A. Bressan, N. Brouillet, E. Brugaletta, B. Bucciarelli, A. Burlacu, A. G. Butkevich, R. Buzzi, E. Caffau, R. Cancelliere, T. Cantat-Gaudin, R. Carballo, T. Carlucci, M. I. Carnerero, J. M. Carrasco, L. Casamiquela, M. Castellani, A. Castro-Ginard, L. Chaoul, P. Charlot, L. Chemin, V. Chiaramida, A. Chiavassa, N. Chornay, G. Comoretto, G. Contursi, W. J. Cooper, T. Cornez, S. Cowell, F. Crifo, M. Cropper, M. Crosta, C. Crowley, C. Dafonte, A. Dapergolas, M. David, P. David, P. deLaverny, F. DeLuise, R. DeMarch, J. DeRidder, R. deSouza, A. deTorres, E. F. del Peloso, E. delPozo, M. Delbo, A. Delgado, J. -B. Delisle, C. Demouchy, T. E. Dharmawardena, P. Di Matteo, S. Diakite, C. Diener, E. Distefano, C. Dolding, B. Edvardsson, H. Enke, C. Fabre, M. Fabrizio, S. Faigler, G. Fedorets, P. Fernique, A. Fienga, F. Figueras, Y. Fournier, C. Fouron, F. Fragkoudi, M. Gai, A. Garcia-Gutierrez, M. Garcia-Reinaldos, M. Garcia-Torres, A. Garofalo, A. Gavel, P. Gavras, E. Gerlach, R. Geyer, P. Giacobbe, G. Gilmore, S. Girona, G. Giu Ff Rida, R. Gomel, A. Gomez, J. Gonzalez-Nunez, I. Gonzalez-Santamaria, J. J. Gonzalez-Vidal, M. Granvik, P. Guillout, J. Guiraud, R. Gutierrez-Sanchez, L. P. Guy, D. Hatzidimitriou, M. Hauser, M. Haywood, A. Helmer, A. Helmi, M. H. Sarmiento, S. L. Hidalgo, T. Hilger, N. Hladczuk, D. Hobbs, G. Holland, H. E. Huckle, K. Jardine, G. Jasniewicz, A. Jean-Antoine Piccolo, O. Jimenez-Arranz, A. Jorissen, J. Juaristi Campillo, F. Julbe, L. Karbevska, P. Kervella, S. Khanna, M. Kontizas, G. Kordopatis, A. J. Korn, A. Kospal, Z. Kostrzewa-Rutkowska, K. Kruszynska, M. Kun, P. Laizeau, S. Lambert, A. F. Lanza, Y. Lasne, J. -F. LeCampion, Y. Lebreton, T. Lebzelter, S. Leccia, N. Leclerc, I. Lecoeur-Taibi, S. Liao, E. L. Licata, H. E. P. Lindstrom, T. A. Lister, E. Livanou, A. Lobel, A. Lorca, C. Loup, P. MadreroPardo, A. MagdalenoRomeo, S. Managau, R. G. Mann, M. Manteiga, J. M. Marchant, M. Marconi, J. Marcos, M. M. S. MarcosSantos, D. MarinPina, S. Marinoni, F. Marocco, D. J. Marshall, L. Martin Polo, J. M. Martin-Fleitas, G. Marton, N. Mary, A. Masip, D. Massari, A. Mastrobuono-Battisti, T. Mazeh, P. J. McMillan, S. Messina, D. Michalik, N. R. Millar, A. Mints, D. Molina, R. Molinaro, L. Molnar, G. Monari, M. Monguio, P. Montegriffo, A. Montero, R. Mor, A. Mora, R. Morbidelli, T. Morel, D. Morris, T. Muraveva, C. P. Murphy, I. Musella, Z. Nagy, L. Noval, F. Ocana, A. Ogden, C. Ordenovic, J. O. Osinde, C. Pagani, I. Pagano, L. Palaversa, P. A. Palicio, L. Pallas-Quintela, A. Panahi, S. Payne-Wardenaar, X. Penalosa Esteller, A. Penttila, B. Pichon, A. M. Piersimoni, F. -X. Pineau, E. Plachy, G. Plum, E. Poggio, A. Prsa, L. Pulone, E. Racero, S. Ragaini, M. Rainer, C. M. Raiteri, N. Rambaux, P. Ramos, M. Ramos-Lerate, P. ReFiorentin, S. Regibo, P. J. Richards, C. Rios Diaz, V. Ripepi, A. Riva, H. -W. Rix, G. Rixon, N. Robichon, A. C. Robin, C. Robin, M. Roelens, H. R. O. Rogues, L. Rohrbasser, M. Romero-Gomez, N. Rowell, F. Royer, D. Ruz Mieres, K. A. Rybicki, G. Sadowski, A. Saez Nunez, A. Sagrista Selles, J. Sahlmann, E. Salguero, N. Samaras, V. Sanchez Gimenez, N. Sanna, R. Santovena, M. Sarasso, M. Schultheis, E. Sciacca, M. Segol, J. C. Segovia, D. Segransan, D. Semeux, S. Shahaf, H. I. Siddiqui, A. Siebert, L. Siltala, A. Silvelo, E. Slezak, I. Slezak, R. L. Smart, O. N. Snaith, E. Solano, F. Solitro, D. Souami, J. Souchay, A. Spagna, L. Spina, F. Spoto, I. A. Steele, H. Steidelmueller, C. A. Stephenson, M. Suveges, J. Surdej, L. Szabados, E. Szegedi-Elek, F. Taris, M. B. Taylor, R. Teixeira, L. Tolomei, N. Tonello, F. Torra, J. Torra, G. Torralba Elipe, M. Trabucchi, A. T. Tsounis, C. Turon, A. Ulla, N. Unger, M. V. Vaillant, E. van Dillen, W. van Reeven, O. Vanel, A. Vecchiato, Y. Viala, D. Vicente, S. Voutsinas, M. Weiler, T. Wevers, L. Wyrzykowski, A. Yoldas, P. Yvard, H. Zhao, J. Zorec, S. Zucker, T. Zwitter
Summary: The third data release of the Gaia mission includes a wide range of new data products, such as an expanded radial velocity survey and extensive astrophysical characterisation. This release provides unprecedented quantity, quality, and variety of source astrophysical data, including spectrophotometry, radial velocities, variables, and astrophysical parameters. It will greatly enhance the potential of Gaia's astrometric, photometric, and radial velocity surveys.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
Marie Karjalainen, Raine Karjalainen, Artie P. Hatzes, Holger Lehmann, Pierre Kervella, Saskia Hekker, Hans Van Winckel, Jakub Uberlauer, Michaela Vitkova, Marek Skarka, Petr Kabath, Saskia Prins, Andrew Tkachenko, William D. Cochran, Alain Jorissen
Summary: This article describes two planetary systems around intermediate-mass red giant branch stars, and provides their orbital parameters and mass estimates through stellar radial velocity measurements and astrometric measurements.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Pierre Kervella, Simon Borgniet, Armando Domiciano de Souza, Antoine Merand, Alexandre Gallenne, Thomas Rivinius, Sylvestre Lacour, Alex Carciofi, Daniel Moser Faes, Jean-Baptiste Le Bouquin, Monica Taormina, Bogumil Pilecki, Jean-Philippe Berger, Philippe Bendjoya, Robert Klement, Florentin Millour, Eduardo Janot-Pacheco, Alain Spang, Farrokh Vakili
Summary: This study used multiple observation techniques to monitor the relative position of the Achernar system and estimate its orbital parameters and physical properties. The results showed that Achernar B orbits the primary Be star with a period of seven years, reaching a minimum distance of 2 astronomical units at periastron. The mass of the Be star was found to be approximately 6.0 times that of the Sun, while the mass of the secondary star was estimated to be approximately 2.0 times that of the Sun. The parameters of Achernar A were found to be in good agreement with the evolutionary model, making Achernar a valuable benchmark for studying fast rotators and intermediate mass binary star evolution.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
N. Nardetto, W. Gieren, J. Storm, V. Hocde, G. Pietrzynski, P. Kervella, A. Merand, A. Gallenne, D. Graczyk, B. Pilecki, E. Poretti, M. Rainer, B. Zgirski, P. Wielgorski, G. Hajdu, M. Gorski, P. Karczmarek, W. Narloch, M. Taormina
Summary: This study quantifies the impact of the surface-brightness color relation (SBCR) on the Baade-Wesselink (BW) projection factor used in distance determination of Cepheids. By analyzing different SBCRs in the literature, it is found that the choice of SBCR has a significant effect on the projection factor, with a scatter of about 8%. Extinction and circumstellar environment have less impact on the projection factor. Efforts should be made to improve the empirical and theoretical SBCR of Cepheids, taking their circumstellar environment into account.
ASTRONOMY & ASTROPHYSICS
(2023)
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Astronomy & Astrophysics
Jens Kammerer, Rachel A. Cooper, Thomas Vandal, Deepashri Thatte, Frantz Martinache, Anand Sivaramakrishnan, Alexander Chaushev, Tomas Stolker, James P. Lloyd, Loic Albert, Rene Doyon, Steph Sallum, Marshall D. Perrin, Laurent Pueyo, Antoine Merand, Alexandre Gallenne, Alexandra Greenbaum, Joel Sanchez-Bermudez, Dori Blakely, Doug Johnstone, Kevin Volk, Andre Martel, Paul Goudfrooij, Michael R. Meyer, Chris J. Willott, Matthew De Furio, Lisa Dang, Michael Radica, Gael Noirot
Summary: Kernel phase imaging (KPI) is used to detect substellar companions and circumstellar dust below the diffraction limit. The James Webb Space Telescope (JWST) provides high-quality images for KPI, and a data reduction pipeline and toolkit have been developed for JWST images. KPI and NIRISS aperture masking interferometry (AMI) perform similarly in observing time, but KPI has higher throughput and is better for observing faint targets at separations greater than 325 mas.
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC
(2023)
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Astronomy & Astrophysics
A. Gallenne, A. Merand, P. Kervella, D. Graczyk, G. Pietrzynski, W. Gieren, B. Pilecki
Summary: The aim of this study is to measure precise and accurate model-independent masses and distances of detached binary stars. The combination of RV measurements with interferometric observations enables the determination of orbital and physical parameters of ten double-lined spectroscopic systems. The results demonstrate that this method provides extremely precise and accurate dynamical masses and orbital parallaxes.
ASTRONOMY & ASTROPHYSICS
(2023)
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Astronomy & Astrophysics
A. Rosales-Guzman, J. Sanchez-Bermudez, C. Paladini, A. Alberdi, W. Brandner, E. Cannon, G. Gonzalez-Tora, X. Haubois, Th. Henning, P. Kervella, M. Montarges, G. Perrin, R. Schodel, M. Wittkowski
Summary: By analyzing high-resolution observations of the M-type AGB star R Car in the near-infrared at different phases, we determined the size of its stellar disk and identified asymmetric and inhomogeneous structures in the CO molecule distribution. This study provides evidence of dust nucleation and wind formation conditions in M-type AGB stars, and highlights the role of magnesium composites in these processes.
ASTRONOMY & ASTROPHYSICS
(2023)
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Astronomy & Astrophysics
L. Eyer, M. Audard, B. Holl, L. Rimoldini, M. I. Carnerero, G. Clementini, J. De Ridder, E. Distefano, D. W. Evans, P. Gavras, R. Gomel, T. Lebzelter, G. Marton, N. Mowlavi, A. Panahi, V. Ripepi, L. Wyrzykowski, K. Nienartowicz, G. Jevardat de Fombelle, I. Lecoeur-Taibi, L. Rohrbasser, M. Riello, P. Garcia-Lario, A. C. Lanzafame, T. Mazeh, C. M. Raiteri, S. Zucker, P. Abraham, C. Aerts, J. J. Aguado, R. I. Anderson, D. Bashi, A. Binnenfeld, S. Faigler, A. Garofalo, L. Karbevska, A. Kospal, K. Kruszynska, M. Kun, A. F. Lanza, S. Leccia, M. Marconi, S. Messina, R. Molinaro, L. Molnar, T. Muraveva, I. Musella, Z. Nagy, I. Pagano, L. Palaversa, E. Plachy, A. Prsa, K. A. Rybicki, S. Shahaf, L. Szabados, E. Szegedi-Elek, M. Trabucchi, F. Barblan, M. Grenon, M. Roelens, M. Suveges
Summary: This article summarizes the variability processing and analysis of the photometric and spectroscopic time series of 1.8 billion sources carried out for Gaia DR3. Through statistical and machine learning methods, 10.5 million variable objects were identified, including 9.5 million variable stars and 1 million active galactic nuclei or 'quasars', along with 2.5 million galaxies. This work provides a comprehensive catalog of variability analysis worldwide for researchers.
ASTRONOMY & ASTROPHYSICS
(2023)
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Astronomy & Astrophysics
Mauricio Cruz Reyes, Richard I. I. Anderson
Summary: We conducted a search for open clusters near classical Galactic Cepheids using high-quality astrometry data. Our findings include the identification of new host clusters and the correction of previous associations. By comparing Cepheids in Milky Way clusters to those in the LMC, we confirmed the accuracy of recent parallax corrections. Our results provide the most accurate calibrations of the Cepheid luminosity scale and precise determination of the residual parallax offset.
ASTRONOMY & ASTROPHYSICS
(2023)
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Astronomy & Astrophysics
Thomas A. Baycroft, Amaury H. M. J. Triaud, Pierre Kervella
Summary: The study suggests the possibility of a circumbinary companion orbiting the common-envelope eclipsing binary HW Virginis, but previous proposed companions have lacked predictability and orbital stability. The analysis also reveals that other periodic signals are likely caused by physical processes on the white dwarf. The full Gaia epoch astrometry data release is expected to provide further confirmation of the existence of circumbinary planets and exploration of white dwarf physics around HW Virginis.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
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Multidisciplinary Sciences
Raffaele Gratton, Dino Mesa, Mariangela Bonavita, Alice Zurlo, Sebastian Marino, Pierre Kervella, Silvano Desidera, Valentina D'Orazi, Elisabetta Rigliaco
Summary: Through analyzing 30 stars in BPMG, the study shows that 20 of them are likely to have a stable Jupiter-like planet. This result suggests that Jupiter-like planets may be more common than previously believed, and the next data release from the Gaia satellite is expected to confirm this prediction.
NATURE COMMUNICATIONS
(2023)