☆ 4.5 Article

Period spacings of gravity modes in rapidly rotating magnetic stars I. Axisymmetric fossil field with poloidal and toroidal components

ASTRONOMY & ASTROPHYSICS (2019)

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ASTRONOMY & ASTROPHYSICS

卷 627, 期 -, 页码 -

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EDP SCIENCES S A

DOI: 10.1051/0004-6361/201935462

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asteroseismology; waves; stars: magnetic field; stars: oscillations; stars: rotation

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Astronomy & Astrophysics

资金

European Research Council (ERC) under the European Union [647383: SPIRE, 670519: MAMSIE]
CNES PLATO grant at CEA/DAp

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摘要

Context. Stellar magnetic fields are often invoked to explain the missing transport of angular momentum observed in models of stellar interiors. However, the properties of an internal magnetic field and the consequences of its presence on stellar evolution are largely unknown. Aims. We study the effect of an axisymmetric internal magnetic field on the frequency of gravity modes in rapidly rotating stars to check whether gravity modes can be used to detect and probe such a field. Methods. Rotation is taken into account using the traditional approximation of rotation and the effect of the magnetic field is computed using a perturbative approach. As a proof of concept, we compute frequency shifts due to a mixed (i.e. with both poloidal and toroidal components) fossil magnetic field for a representative model of a known magnetic, rapidly rotating, slowly pulsating B-type star: HD 43317. Results. We find that frequency shifts induced by the magnetic field scale with the square of its amplitude. A magnetic field with a near-core strength of the order of 150 kG (which is consistent with the observed surface field strength of the order of 1 kG) leads to signatures that are detectable in period spacings for high-radial-order gravity modes. Conclusions. The predicted frequency shifts can be used to constrain internal magnetic fields and offer the potential for a significant step forward in our interpretation of the observed structure of gravity-mode period spacing patterns in rapidly rotating stars.

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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)

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Article Astronomy & Astrophysics

Tidal perturbations and eclipse mapping in the pulsations in the hierarchical triple system U Gru

C. Johnston, A. Tkachenko, T. Van Reeth, D. M. Bowman, K. Pavlovski, H. Sana, S. Sekaran

Summary: Researchers investigated U Gru and found that it is likely a hierarchical triple system. They proposed that the series of frequencies separated by the orbital frequency can be reproduced by eclipse mapping caused by tidal forces. The study demonstrates the influence of tidal forces on the pulsations of U Gru.

ASTRONOMY & ASTROPHYSICS (2023)

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Article Astronomy & Astrophysics

Tidally perturbed gravity-mode pulsations in a sample of close eclipsing binaries

T. Van Reeth, C. Johnston, J. Southworth, J. Fuller, D. M. Bowman, L. Poniatowski, J. Van Beeck

Summary: By analyzing the observations of 35 binary systems, we have detected five gravitationally-mode pulsations caused by tidal perturbations. These pulsations not only exist in different regions of the same star, but also exhibit the same amplitude and phase variations in multiple photometric passbands. These findings contribute to a better understanding of binary systems and stellar interior structure.

ASTRONOMY & ASTROPHYSICS (2023)

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Article Astronomy & Astrophysics

Identifying and characterising the population of hot sub-luminous stars with multi-colour MeerLICHT data

P. Ranaivomanana, C. Johnston, P. J. Groot, C. Aerts, R. Lees, L. IJspeert, S. Bloemen, M. Klein-Wolt, P. Woudt, E. Koerding, R. Le Poole, D. Pieterse

Summary: This study showcases the capabilities of the MeerLICHT telescope in detecting faint hot subdwarfs and identifying their dominant frequency. The research highlights the importance of studying these objects for accurate probing of stellar interiors in the future.

ASTRONOMY & ASTROPHYSICS (2023)

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Article Astronomy & Astrophysics

Spectroscopic and evolutionary analyses of the binary system AzV 14 outline paths toward the WR stage at low metallicity

D. Pauli, L. M. Oskinova, W. -R. Hamann, D. M. Bowman, H. Todt, T. Shenar, A. A. C. Sander, C. Erba, V. M. A. Gomez-Gonzalez, C. Kehrig, J. Klencki, R. Kuiper, A. Mehner, S. E. de Mink, M. S. Oey, V. Ramachandran, A. Schootemeijer, S. Reyero Serantes, A. Wofford

Summary: The origin of Wolf-Rayet (WR) stars in low-metallicity galaxies is not yet understood. This study analyzes the massive O star, AzV 14, to investigate the evolutionary paths from O-type to WR stage. The analysis shows that AzV 14 is a close binary system with two main sequence stars, and the binary evolutionary models can explain the observed parameters and predict the evolution into WR stars with different temperatures.

ASTRONOMY & ASTROPHYSICS (2023)

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Article Astronomy & Astrophysics

X-Shooting ULLYSES: Massive stars at low metallicity I. Project description

Jorick S. S. Vink, A. Mehner, P. A. Crowther, A. Fullerton, M. Garcia, F. Martins, N. Morrell, L. M. Oskinova, N. St-Louis, A. ud-Doula, A. A. C. Sander, H. Sana, J. -C. Bouret, B. Kubatova, P. Marchant, L. P. Martins, A. Wofford, J. Th. van Loon, O. Grace Telford, Y. Gotberg, D. M. Bowman, C. Erba, V. M. Kalari, M. Abdul-Masih, T. Alkousa, F. Backs, C. L. Barbosa, S. R. Berlanas, M. Bernini-Peron, J. M. Bestenlehner, R. Blomme, J. Bodensteiner, S. A. Brands, C. J. Evans, A. David-Uraz, F. A. Driessen, K. Dsilva, S. Geen, V. M. A. Gomez-Gonzalez, L. Grassitelli, W. -R. Hamann, C. Hawcroft, A. Herrero, E. R. Higgins, D. John Hillier, R. Ignace, A. G. Istrate, L. Kaper, N. D. Kee, C. Kehrig, Z. Keszthelyi, J. Klencki, A. de Koter, R. Kuiper, E. Laplace, C. J. K. Larkin, R. R. Lefever, C. Leitherer, D. J. Lennon, L. Mahy, J. Maiz Apellaniz, G. Maravelias, W. Marcolino, A. F. McLeod, S. E. de Mink, F. Najarro, M. S. Oey, T. N. Parsons, D. Pauli, M. G. Pedersen, R. K. Prinja, V. Ramachandran, M. C. Ramirez-Tannus, G. N. Sabhahit, A. Schootemeijer, S. Reyero Serantes, T. Shenar, G. S. Stringfellow, N. Sudnik, F. Tramper, L. Wang

Summary: Observations of various celestial events in the low-metallicity Universe indicate that it is different from our own Galaxy. Understanding the physics and evolution of massive stars at low metallicity is crucial for explaining many transient phenomena. The combination of UV and optical spectra obtained from the ULLYSES and XShootU projects is critical for accurately determining stellar parameters and wind properties, and will greatly contribute to astrophysical research.

ASTRONOMY & ASTROPHYSICS (2023)

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Article Astronomy & Astrophysics

A calibration point for stellar evolution from massive star asteroseismology

Siemen Burssens, Dominic M. Bowman, Mathias Michielsen, Sergio Simon-Diaz, Conny Aerts, Vincent Vanlaer, Gareth Banyard, Nicolas Nardetto, Richard H. D. Townsend, Gerald Handler, Joey S. G. Mombarg, Roland Vanderspek, George Ricker

Summary: Massive stars are progenitors of supernovae, neutron stars, and black holes. This study deduces the convective core mass and demonstrates non-rigid radial rotation in a supernova progenitor, HD 192575, using various methods including asteroseismology and space-based photometry. The results provide important insights into the rotation and mixing processes inside massive stars.

NATURE ASTRONOMY (2023)

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Article Astronomy & Astrophysics

The Unexpected Optical and Ultraviolet Variability of the Standard Star α Sex (HD 87887)

Richard Monier, Dominic M. Bowman, Yveline Lebreton, Morgan Deal

Summary: Analysis of TESS light curves of α Sex (HD 87887) reveals low-frequency pulsations with a period of about 9.1 hours in this spectroscopic A0 III standard star. IUE observations indicate large flux variations in the far-UV and mid-UV, accompanied by changes in brightness in the V band. The ultraviolet variability may be caused by the eclipse of an undetected companion, potentially confirming through further monitoring with TESS.

ASTRONOMICAL JOURNAL (2023)

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Article Astronomy & Astrophysics

The Surface Composition of Six Newly Discovered Chemically Peculiar Stars. Comparison to the HgMn Stars mu Lep and beta Scl and the Superficially Normal B Star nu Cap

Richard Monier, E. Niemczura, D. W. Kurtz, S. Rappaport, D. M. Bowman, Simon J. J. Murphy, Yveline Lebreton, Remko Stuik, Morgan Deal, Thibault Merle, T. Kilicoglu, M. Gebran, Ewen Le Ster

Summary: In this study, we conducted a detailed abundance analysis of six bright, slowly rotating late B-stars. The spectra of these stars revealed the presence of Hg II lines and strong absorption lines from various elements. Comparisons with synthetic spectra showed significant overabundances of certain elements and underabundances of others. The investigated stars were found to be new chemically peculiar stars, most of which are new HgMn stars. The evolutionary status, ages, and masses of these stars were determined, and their orbital period was measured for HD 99803A.

ASTRONOMICAL JOURNAL (2023)

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Article Astronomy & Astrophysics

The ESO UVES/FEROS Large Programs of TESS OB pulsators I. Global stellar parameters from high-resolution spectroscopy

Nadya Serebriakova, Andrew Tkachenko, Sarah Gebruers, Dominic M. Bowman, Timothy Van Reeth, Laurent Mahy, Siemen Burssens, Luc IJspeert, Hugues Sana, Conny Aerts

Summary: Studying a large sample of O- and B-type stars to obtain accurate atmospheric parameters and investigate line-profile broadening, which can improve our understanding of their interior structure.

ASTRONOMY & ASTROPHYSICS (2023)

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Article Astronomy & Astrophysics

Mode coupling coefficients between the convective core and radiative envelope of ? Doradus and slowly pulsating B stars

C. Aerts, S. Mathis

Summary: This study investigates the mode coupling coefficients of γ Dor and SPB stars using asteroseismic forward models and finds that young, fast-rotating γ Dor stars exhibit strong coupling between inertial modes in the rotating convective core and gravito-inertial modes in the radiative envelope. In contrast, no such coupling has been observed in SPB stars.

ASTRONOMY & ASTROPHYSICS (2023)

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Article Astronomy & Astrophysics

Unresolved Rossby and gravity modes in 214 A and F stars showing rotational modulation

Andreea Henriksen, Victoria Antoci, Hideyuki Saio, Frank Grundahl, Hans Kjeldsen, Timothy Van Reeth, Dominic M. Bowman, Peter Papics, Peter De Cat, Joachim Kruger, M. Fredslund Andersen, P. L. Palle

Summary: In this study, we analyze 214 A- and F-type stars observed by Kepler and find distinct periodic signals known as the hump and spike, attributed to Rossby modes and magnetic stellar spots or overstable convective modes, respectively. We determine the power of the hump features and observe additional gravity-mode humps occurring at higher frequencies than the spike. We also investigate the correlation between the spike amplitude and the power in different oscillation modes.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2023)

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Article Astronomy & Astrophysics

Photometric variability of blue straggler stars in M67 with TESS and K2

Nagaraj Vernekar, Annapurni Subramaniam, Vikrant V. Jadhav, Dominic M. Bowman

Summary: Blue straggler stars (BSSs) with white dwarf (WD) companions were observed in M67, indicating a mass transfer pathway of formation. Light curves from K2 and TESS data were analyzed to study five BSSs in M67 that are known to be spectroscopic binaries. Variability was detected in WOCS 1007, with the light curve dominated by ellipsoidal variation. Its companion was estimated to be a low-mass WD with an orbital period of 4.212 & PLUSMN; 0.041 d. Other BSSs showed no eclipses or pulsations, confirming the absence of high inclination inner binaries.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2023)

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Article Multidisciplinary Sciences

A massive helium star with a sufficiently strong magnetic field to form a magnetar

Tomer Shenar, Gregg A. Wade, Pablo Marchant, Stefano Bagnulo, Julia Bodensteiner, Dominic M. Bowman, Avishai Gilkis, Norbert Langer, Andre Nicolas-Chene, Lidia Oskinova, Timothy Van Reeth, Hugues Sana, Nicole St-Louis, Alexandre Soares de Oliveira, Helge Todt, Silvia Toonen

Summary: This study identifies a unique Wolf-Rayet star with a strong magnetic field that is capable of leaving a magnetar remnant. Researchers suggest that this star is formed through the merger of two lower-mass helium stars.

SCIENCE (2023)

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Review Astronomy & Astrophysics

The Structure and Evolution of Stars: Introductory Remarks

Dominic M. Bowman, Jennifer van Saders, Jorick S. Vink

Summary: In this introductory chapter, we highlight the recent progress made in understanding the physics of stellar interiors. We combine insights from observations, modeling, and simulations to provide a comprehensive picture of stellar structure theory and identify areas for improvement. Furthermore, we present an overarching perspective that links all the themes of subsequent chapters.

GALAXIES (2023)

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