Article
Astronomy & Astrophysics
E. Ilin, K. Poppenhaeger
Summary: Planets that orbit magnetically active stars can interact with their magnetic fields, resulting in modulation of stellar activity known as SPI. The magnitude and intermittent nature of this interaction pose challenges, but studying the optical light curves of AU Mic reveals potential signs of SPI with its innermost companion, AU Mic b. Further observation may confirm the presence of flaring SPI with orbital phase.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Robert D. Kavanagh, Harish K. Vedantham
Summary: Recent low-frequency radio observations indicate that some nearby M dwarfs may be magnetically interacting with undetected close-in planets, causing radio emission through the electron cyclotron maser instability. This finding could help reveal the presence of hard-to-detect close-in planets around M dwarfs. A geometric model is developed to explore the emission visibility as a function of time, based on key parameters characterizing star-planet interactions. The model shows that the appearance of emission is highly dependent on underlying parameters and is not limited to specific orbital phases or geometric configurations.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
N. Walters, J. Farihi, T. R. Marsh, S. Bagnulo, J. D. Landstreet, J. J. Hermes, N. Achilleos, A. Wallach, M. Hart, C. J. Manser
Summary: Despite limited detections of Balmer emission lines in white dwarfs, the study of these emission features reveals variations in strength and potential evolution of the emission region. While some proposed models may face challenges in explaining these observations, the data suggests that the chromospheric emission in these white dwarfs may be intrinsic.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Suvrat Rao, Camilla Pezzotti, Georges Meynet, Patrick Eggenberger, Gael Buldgen, Christoph Mordasini, Vincent Bourrier, Sylvia Ekstrom, Cyril Georgy
Summary: The study explores the impact of stellar rotation on tidal interactions and planetary evaporation processes in star-planet systems. Results show that rapid initial stellar rotation and efficient angular momentum transport contribute to the absence of planets in certain regions after the pre-main-sequence phase. Comparisons with observed exoplanets around solar mass stars demonstrate good agreement, without needing to adjust initial parameters to fit observations.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
M. Damasso, D. Locci, S. Benatti, A. Maggio, D. Nardiello, M. Baratella, K. Biazzo, A. S. Bonomo, S. Desidera, V. D'Orazi, M. Mallonn, A. F. Lanza, A. Sozzetti, F. Marzari, F. Borsa, J. Maldonado, L. Mancini, E. Poretti, G. Scandariato, A. Bignamini, L. Borsato, R. Capuzzo Dolcetta, M. Cecconi, R. Claudi, R. Cosentino, E. Covino, A. Fiorenzano, A. Harutyunyan, A. W. Mann, G. Micela, E. Molinari, M. Molinaro, I. Pagano, M. Pedani, M. Pinamonti, G. Piotto, H. Stoev
Summary: GAPS collaboration conducted spectroscopic and photometric follow-up of young stars with planets to understand the early evolution of planetary systems. They measured the masses, sizes, and orbital parameters of the planets around HD63433 and studied the evolution of atmospheric mass-loss rate. Their findings suggest that HD63433 c might be a dense mini-Neptune.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
A. Strugarek, R. Fares, V Bourrier, A. S. Brun, V Reville, T. Amari, Ch Helling, M. Jardine, J. Llama, C. Moutou, A. A. Vidotto, P. J. Wheatley, P. Zarka
Summary: We study the magnetic interactions between stars and close-in planets and simulate them on HD 189733. By comparing the predicted signal with the observed signal, we find that some models are compatible with an interpretation based on star-planet magnetic interactions. We also find that the observed signal can only be explained by a stretch-and-break interaction mechanism. Furthermore, we demonstrate that past observational activities can only detect 12% to 23% of star-planet interactions.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
N. L. Eisner, C. Johnston, S. Toonen, A. J. Frost, S. Janssens, C. J. Lintott, S. Aigrain, H. Sana, M. Abdul-Masih, K. Z. Arellano-Cordova, P. G. Beck, E. Bordier, E. Cannon, A. Escorza, M. Fabry, L. Hermansson, S. B. Howell, G. Miller, S. Sheyte, S. Alhassan, E. M. L. Baeten, F. Barnet, S. J. Bean, M. Bernau, D. M. Bundy, M. Z. Di Fraia, F. M. Emralino, B. L. Goodwin, P. Hermes, T. Hoffman, M. Huten, R. Janicek, S. Lee, M. T. Mazzucato, D. J. Rogers, M. P. Rout, J. Sejpka, C. Tanner, I. A. Terentev, D. Urvoy
Summary: We report the discovery and analysis of a massive, compact, hierarchical triple star system identified by citizen scientists in data obtained by NASA's TESS. Follow-up observations and dynamical modeling reveal that the system is comprised of three OB stars, with a compact eclipsing binary and a non-eclipsing tertiary star. The non-eclipsing tertiary star is more massive than the combined mass of the inner binary, suggesting future phases of mass transfer and potential evolution into a double neutron star or a Thorne-Zytkow object.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Baptiste Klein, Norbert Zicher, Robert D. Kavanagh, Louise D. Nielsen, Suzanne Aigrain, Aline A. Vidotto, Oscar Barragan, Antoine Strugarek, Belinda Nicholson, Jean-Francois Donati, Jerome Bouvier
Summary: In this study, a spectroscopic analysis of the planet-hosting star AU Mic was conducted, revealing the radial velocity signals of its two close-in transiting planets. An independent measurement of the radial velocity semi-amplitude of AU Mic c was also performed, providing further insights into its unique properties. The study highlights the significant evolution of stellar magnetic activity and chromospheric variability.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
S. Desidera, M. Damasso, R. Gratton, S. Benatti, D. Nardiello, V. D'Orazi, A. F. Lanza, D. Locci, F. Marzari, D. Mesa, S. Messina, I. Pillitteri, A. Sozzetti, J. Girard, A. Maggio, G. Micela, L. Malavolta, V. Nascimbeni, M. Pinamonti, V. Squicciarini, J. Alcala, K. Biazzo, A. Bohn, M. Bonavita, K. Brooks, G. Chauvin, E. Covino, P. Delorme, J. Hagelberg, M. Janson, A. -M. Lagrange, C. Lazzoni
Summary: TESS confirmed the presence of the transiting planet TOI-179 orbiting the K dwarf HD 18599. The system was characterized using TESS photometric time series, HARPS radial velocity monitoring, and high-contrast imaging observations from VLT. Gaussian process regression analysis was used to model the magnetic activity of the star and identify the Keplerian signature of the transiting planet.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
L. Sabin, V Gomez-Llanos, C. Morisset, V. M. A. Gomez-Gonzalez, M. A. Guerrero, H. Todt, X. Fang
Summary: After performing morpho-kinematic analysis, the study presents the nebular and stellar analysis of the planetary nebula (PN) PC 22. The analysis relied on Monte Carlo analysis and the pyneb code to propagate uncertainties. The results showed electronic temperatures of approximately 10,800 K and 13,000 K in the innermost region of the nebula, along with electronic densities of approximately 600 cm(-3). Additionally, the study used a machine learning algorithm to calculate ionization correction factors specifically adapted to PC 22, and identified [WO1] subtype as the most suitable classification for the stellar spectrum.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
C. Fischer, J. Saur
Summary: This study focuses on the effects of electromagnetic star-planet interaction (SPI) on other planets and the stellar wind. By analyzing the wave structures resulting from the interaction, the researchers found that SPI can lead to wing-wing interaction between planets. The study used a magnetohydrodynamic model to simulate a stellar system with two innermost planets of TRAPPIST-1, and the results showed that the interaction between the stellar wind and one of the planets resulted in the formation of an Alfven wing.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
J. M. Almenara, X. Bonfils, T. Forveille, N. Astudillo-Defru, D. R. Ciardi, R. P. Schwarz, K. A. Collins, M. Cointepas, M. B. Lund, F. Bouchy, D. Charbonneau, R. F. Diaz, X. Delfosse, R. C. Kidwell, M. Kunimoto, D. W. Latham, J. J. Lissauer, F. Murgas, G. Ricker, S. Seager, M. Vezie, D. Watanabe
Summary: The Transiting Exoplanet Survey Satellite (TESS) mission has identified a sub-Saturn planet orbiting the M4 dwarf star TOI-3884, with a deep and asymmetric transit-like signal. Follow-up observations have confirmed the non-uniformity of the transit, indicating interactions between the planet and the host star.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
D. T. Hoai, P. T. Nhung, P. Darriulat, P. N. Diep, N. B. Ngoc, T. T. Thai, P. Tuan-Anh
Summary: This article presents ALMA observations of L-2 Pup, showing the formation and morphology of the wind and its movement at different distances and angles. The results challenge standard wind models and have important implications.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
M. Damasso, J. Rodrigues, A. Castro-Gonzalez, B. Lavie, J. Davoult, M. R. Zapatero Osorio, J. Dou, S. G. Sousa, J. E. Owen, P. Sossi, V. Adibekyan, H. Osborn, Z. Leinhardt, Y. Alibert, C. Lovis, E. Delgado Mena, A. Sozzetti, S. C. C. Barros, D. Bossini, C. Ziegler, D. R. Ciardi, E. C. Matthews, P. J. Carter, J. Lillo-Box, A. Suarez Mascareno, S. Cristiani, F. Pepe, R. Rebolo, N. C. Santos, C. Allende Prieto, S. Benatti, F. Bouchy, C. Briceno, P. Di Marcantonio, V. D'Odorico, X. Dumusque, J. A. Egger, D. Ehrenreich, J. Faria, P. Figueira, R. Genova Santos, E. J. Gonzales, J. I. Gonzalez Hernandez, N. Law, G. Lo Curto, A. W. Mann, C. J. A. P. Martins, A. Mehner, G. Micela, P. Molaro, N. J. Nunes, E. Palle, E. Poretti, J. E. Schlieder, S. Udry
Summary: This study confirms the planetary nature of TOI-469.01 and discovers two additional close-in companions around the K0V star HIP 29442 through observations and analysis using the ESPRESSO instrument. The analysis of the light curves reveals the orbital periods, mass, radius, and bulk densities of the planets in this compact multi-planet system, providing important insights into the properties and evolution of close-in small-size exoplanets.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
B. Finociety, J-F. Donati, P. Cristofari, C. Moutou, C. Cadieux, N. J. Cook, E. Artigau, C. Baruteau, F. Debras, P. Fouque, J. Bouvier, S. H. P. Alencar, X. Delfosse, K. Grankin, A. Carmona, P. Petit, A. Kospal
Summary: We present the results of spectropolarimetric monitoring of the young Sun-like star V1298 Tau using the near-infrared spectropolarimeter SPIRou. The study reveals the large-scale magnetic topology of the star, which is mainly poloidal and axisymmetric, and shows signs of a possible polarity reversal. In addition, the study also finds that the surface of V1298 Tau experiences a stronger differential rotation compared to the Sun. The detection of the radial velocity signature of the outermost planet and the determination of its properties are also reported.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
R. M. G. de Albuquerque, J. F. Gameiro, S. H. P. Alencar, J. J. G. Lima, C. Sauty, C. Melo
ASTRONOMY & ASTROPHYSICS
(2020)
Article
Astronomy & Astrophysics
V Bourrier, D. Kitzmann, T. Kuntzer, V Nascimbeni, M. Lendl, B. Lavie, H. J. Hoeijmakers, L. Pino, D. Ehrenreich, K. Heng, R. Allart, H. M. Cegla, X. Dumusque, C. Melo, N. Astudillo-Defru, D. A. Caldwell, M. Cretignier, H. Giles, C. E. Henze, J. Jenkins, C. Lovis, F. Murgas, F. Pepe, G. R. Ricker, M. E. Rose, S. Seager, D. Segransan, A. Suarez-Mascareno, S. Udry, R. Vanderspek, A. Wyttenbach
ASTRONOMY & ASTROPHYSICS
(2020)
Article
Astronomy & Astrophysics
M. Lombart, G. Chauvin, P. Rojo, E. Lagadec, P. Delorme, H. Beust, M. Bonnefoy, R. Galicher, R. Gratton, D. Mesa, M. Bonavita, F. Allard, A. Bayo, A. Boccaletti, S. Desidera, J. Girard, J. S. Jenkins, H. Klahr, G. Laibe, A-M Lagrange, C. Lazzoni, G-D Marleau, D. Minniti, C. Mordasini
ASTRONOMY & ASTROPHYSICS
(2020)
Article
Astronomy & Astrophysics
J. Seidel, D. Ehrenreich, V Bourrier, R. Allart, O. Attia, H. J. Hoeijmakers, M. Lendl, E. Linder, A. Wyttenbach, N. Astudillo-Defru, D. Bayliss, H. M. Cegla, K. Heng, B. Lavie, C. Lovis, C. Melo, F. Pepe, L. A. dos Santos, D. Segransan, S. Udry
ASTRONOMY & ASTROPHYSICS
(2020)
Article
Astronomy & Astrophysics
H. J. Hoeijmakers, J. Seidel, L. Pino, D. Kitzmann, J. P. Sindel, D. Ehrenreich, A. Oza, V Bourrier, R. Allart, A. Gebek, C. Lovis, S. N. Yurchenko, N. Astudillo-Defru, D. Bayliss, H. Cegla, B. Lavie, M. Lendl, C. Melo, F. Murgas, V Nascimbeni, F. Pepe, D. Segransan, S. Udry, A. Wyttenbach, K. Heng
ASTRONOMY & ASTROPHYSICS
(2020)
Article
Astronomy & Astrophysics
S. Zuniga-Fernandez, A. Bayo, P. Elliott, C. Zamora, G. Corvalan, X. Haubois, J. M. Corral-Santana, J. Olofsson, N. Huelamo, M. F. Sterzik, C. A. O. Torres, G. R. Quast, C. H. F. Melo
Summary: Our study identified 68 spectroscopic binary (SB) candidates from a sample of 410 objects, suggesting a higher SB fraction in the youngest associations. The results are crucial for revising membership in young stellar associations and could indicate a non-universal multiplicity among SACY associations.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
M. Cointepas, J. M. Almenara, X. Bonfils, F. Bouchy, N. Astudillo-Defru, F. Murgas, J. F. Otegi, A. Wyttenbach, D. R. Anderson, E. Artigau, B. L. Canto Martins, D. Charbonneau, K. A. Collins, K. Collins, J-J Correia, S. Curaba, A. Delboulbe, X. Delfosse, R. F. Diaz, C. Dorn, R. Doyon, P. Feautrier, P. Figueira, T. Forveille, G. Gaisne, T. Gan, L. Gluck, R. Helled, C. Hellier, L. Jocou, P. Kern, S. Lafrasse, N. Law, I. C. Leao, C. Lovis, Y. Magnard, A. W. Mann, D. Maurel, J. R. de Medeiros, C. Melo, T. Moulin, F. Pepe, P. Rabou, S. Rochat, D. R. Rodriguez, A. Roux, N. C. Santos, D. Segransan, E. Stadler, E. B. Ting, J. D. Twicken, S. Udry, W. C. Waalkes, R. G. West, A. Wunsche, C. Ziegler, G. Ricker, R. Vanderspek, D. W. Latham, S. Seager, J. Winn, J. M. Jenkins
Summary: A new sub-Neptune planet TOI-269 close to the transition between super-Earths and sub-Neptunes has been confirmed, with high eccentricity and potential interactions leading to its current orbit. The system, with a few Gyr old star, does not display signs of being dynamically young. Further characterization of TOI-269 b's atmosphere through transmission spectroscopy could provide valuable insights into comparing it to other sub-Neptunes.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
F. Murgas, N. Astudillo-Defru, X. Bonfils, I Crossfield, J. M. Almenara, J. Livingston, K. G. Stassun, J. Korth, J. Orell-Miquel, G. Morello, J. D. Eastman, J. J. Lissauer, S. R. Kane, F. Y. Morales, M. W. Werner, V Gorjian, B. Benneke, D. Dragomir, E. C. Matthews, S. B. Howell, D. Ciardi, E. Gonzales, R. Matson, C. Beichman, J. Schlieder, K. A. Collins, K. Collins, E. L. N. Jensen, P. Evans, F. J. Pozuelos, M. Gillon, E. Jehin, K. Barkaoui, E. Artigau, F. Bouchy, D. Charbonneau, X. Delfosse, R. F. Diaz, R. Doyon, P. Figueira, T. Forveille, C. Lovis, C. Melo, G. Gaisne, F. Pepe, N. C. Santos, D. Segransan, S. Udry, R. F. Goeke, A. M. Levine, E. Quintana, N. M. Guerrero, I Mireles, D. A. Caldwell, P. Tenenbaum, C. E. Brasseur, G. Ricker, R. Vanderspek, D. W. Latham, S. Seager, J. Winn, J. M. Jenkins
Summary: This article confirms and characterizes the planetary nature of the transiting planet candidate TOI-674b using various observational methods. TOI-674b is identified as a low-density super-Neptune orbiting a nearby M dwarf in the Neptunian desert. It is a promising target for atmospheric characterization with the James Webb Space Telescope.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
M. Baratella, V D'Orazi, V Sheminova, L. Spina, G. Carraro, R. Gratton, L. Magrini, S. Randich, M. Lugaro, M. Pignatari, D. Romano, K. Biazzo, A. Bragaglia, G. Casali, S. Desidera, A. Frasca, G. de Silva, C. Melo, M. Van der Swaelmen, G. Tautvaisiene, F. M. Jimenez-Esteban, G. Gilmore, T. Bensby, R. Smiljanic, A. Bayo, E. Franciosini, A. Gonneau, A. Hourihane, P. Jofre, L. Monaco, L. Morbidelli, G. Sacco, L. Sbordone, C. Worley, S. Zaggia
Summary: This study focuses on the chemical compositions of young open clusters, finding anomalies such as sub-solar iron content and super-solar abundances of certain species. The research confirms super-solar values for barium in young clusters, while copper levels remain similar to solar values. The study suggests that elements like strontium, zirconium, lanthanum, and cerium may serve as better tracers of s-process in young clusters, and calls for further observations to address the Ba puzzle.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
Zewen Jiang, Wei Wang, Guo Chen, Fei Yan, Heather M. Cegla, Patricio Rojo, Yaqing Shi, Qinglin Ouyang, Meng Zhai, Yujuan Liu, Fei Zhao, Yuqin Chen
Summary: Transit spectroscopy is a commonly used technique to study the atmosphere of exoplanets. In this study, the transmission spectra of WASP-85Ab were obtained and Ha, Ca II, and Li I absorptions were tentatively detected.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
Joseph Harrington, Michael D. D. Himes, Patricio E. E. Cubillos, Jasmina Blecic, Patricio M. M. Rojo, Ryan C. C. Challener, Nate B. B. Lust, M. Oliver Bowman, Sarah D. D. Blumenthal, Ian Dobbs-Dixon, Andrew S. D. Foster, Austin J. J. Foster, M. R. Green, Thomas J. J. Loredo, Kathleen J. J. McIntyre, Madison M. M. Stemm, David C. C. Wright
Summary: This paper presents an open-source Bayesian Atmospheric Radiative Transfer (BART) retrieval package, which can estimate and determine the thermal profile and chemical abundances of an atmosphere from observations. The package consists of several components, including a parallel Bayesian sampler, a radiative-transfer model, a code for calculating abundances, and a test suite. The authors invite the community to use and improve these tools and provide an application example using BART for exoplanet data.
PLANETARY SCIENCE JOURNAL
(2022)
Article
Astronomy & Astrophysics
Erin Redwing, Imke de Pater, Statia Luszcz-Cook, Katherine de Kleer, Arielle Moullet, Patricio M. Rojo
Summary: We conducted the first comprehensive study on NaCl and KCl gases in Io's atmosphere, investigating their characteristics and inferring properties of Io's volcanoes and subsurface magma chambers. The spatial distribution and high temperatures suggest a volcanic origin, with a higher preference for outgassing KCl over NaCl.
PLANETARY SCIENCE JOURNAL
(2022)
Article
Astronomy & Astrophysics
Fiona Nichols-Fleming, Paul Corlies, Alexander G. Hayes, Mate Adamkovics, Patricio Rojo, Sebastien Rodriguez, Elizabeth P. Turtle, Juan M. Lora, Jason M. Soderblom
Summary: Recent observations of Titan using near-infrared instruments have shown significant subseasonal variations in its atmosphere, with haze opacity decreasing in some regions and increasing in others over short time periods. These rapid changes suggest dynamic processes at play in the distribution of hazes in Titan's atmosphere, in addition to the known seasonal variations.
PLANETARY SCIENCE JOURNAL
(2021)
Article
Astronomy & Astrophysics
E. T. Whelan, I. Pascucci, U. Gorti, S. Edwards, R. D. Alexander, M. F. Sterzik, C. Melo
Summary: Spectroastrometry is used to study the low-velocity component (LVC) of optical forbidden emission from T Tauri stars RU Lupi and AS 205 N. It is found that the LVC of RU Lupi may trace a wide-angled MHD disk wind, while AS 205 N exhibits a complex outflow system.
ASTROPHYSICAL JOURNAL
(2021)
Article
Astronomy & Astrophysics
Imke de Pater, Statia Luszcz-Cook, Patricio Rojo, Erin Redwing, Katherine de Kleer, Arielle Moullet
PLANETARY SCIENCE JOURNAL
(2020)