A Portrait of the Rotation of Ultra-cool Dwarfs Revealed by TESS

Autor: D. O. Fontinele, P. D. S. de Lima, Y. S. Messias, R. L. Gomes, C. E. Ferreira Lopes, B. L. Canto Martins, I. C. Leão, J. M. De Araújo, E. Janot Pacheco, J. R. De Medeiros

Publikováno v: The Astrophysical Journal, Vol 973, Iss 2, p 106 (2024)

This study presents the results of a search for rotation signatures in 250 Gaia Data Release 3 ultra-cool dwarfs (UCDs) with TESS light curves (LCs). We identified 71 targets with unambiguous periodicities, of which 61 present rotation signatures and

Externí odkaz: https://doaj.org/article/f4a00210a01b4ce0aa200f4cc3eb2b20

Accurate mass-radius ratios for Hyades white dwarfs

Autor: L Pasquini, A F Pala, M Salaris, H-G Ludwig, I Leão, A Weiss, J R de Medeiros

We use the ESPRESSO spectrograph at the Very Large Telescope to measure velocity shifts and gravitational redshifts of eight bona fide Hyades white dwarfs, with an accuracy better than 1.5 percent. By comparing the gravitational redshift measurements

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::54a0d2f8bf2ad4c10c21dbe921040a08
http://arxiv.org/abs/2304.10485

A dearth of close-in planets around rapidly rotating stars or a dearth of data?

Autor: Y. S. Messias, L. L. A. de Oliveira, R. L. Gomes, M. I. Arruda Gonçalves, B. L. Canto Martins, I. C. Leão, J. R. De Medeiros

A dearth of close-in planets orbiting rapid rotators was reported almost a decade ago. According to this view only slowly spinning stars with rotation periods longer than 5-10 days would host planets with orbital periods shorter than 2 or 3 days. Thi

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::54791fb3b25e18268f7600b3dd55c023

Masses and compositions of three small planets orbiting the nearby M dwarf L231-32 (TOI-270) and the M dwarf radius valley

Autor: V. Van Eylen, M. Esposito, D. A. Caldwell, Sara Seager, David Charbonneau, M. R. Zapatero Osorio, René Doyon, K. W. F. Lam, J. R. De Medeiros, Xavier Bonfils, Carina M. Persson, Nuno C. Santos, Judith Korth, A. Suárez Mascareño, Fei Dai, Teriyuki Hirano, C. Lovis, Enric Palle, Norio Narita, Francesco Pepe, A. P. Hatzes, Jon M. Jenkins, Hannah L. M. Osborne, Anders Bo Justesen, Nicola Astudillo-Defru, Thomas Mikal-Evans, Felipe Murgas, J. Cabrera, Iskra Georgieva, Davide Gandolfi, Savita Mathur, Grzegorz Nowak, Gábor Fűrész, E. Goffo, X. Delfosse, Eike W. Guenther, David W. Latham, François Bouchy, Baptiste Lavie, Rodrigo F. Díaz, Étienne Artigau, C. S. K. Ho, Ronald E. Mennickent, Stéphane Udry, Petr Kabath, John H. Livingston, T. Forveille, Roland Vanderspek, George R. Ricker, James E. Owen, Seth Redfield, J. D. Twicken, B. Campos Estrada, J. Šubjak, William D. Cochran, Mario Damasso, Daniel Foreman-Mackey, Simon Albrecht, S. Grziwa, Jose-Manuel Almenara, Joshua N. Winn, Susan E. Mullally, L. M. Serrano, P. Figueira, Alexis M. S. Smith, M. Fridlund, Oscar Barragán, S. C. C. Barros, Rafael Luque, Szilard Csizmadia, Emil Knudstrup, Priyanka Chaturvedi

Publikováno v: Monthly Notices of the Royal Astronomical Society
Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P-Oxford Open Option A, 2021, ⟨10.1093/mnras/stab2143⟩
Van Eylen, V, Astudillo-Defru, N, Bonfils, X, Livingston, J, Hirano, T, Luque, R, Lam, K W F, Justesen, A B, Winn, J N, Gandolfi, D, Nowak, G, Palle, E, Albrecht, S, Dai, F, Campos Estrada, B, Owen, J E, Foreman-Mackey, D, Fridlund, M, Korth, J, Mathur, S, Forveille, T, Mikal-Evans, T, Osborne, H L M, Ho, C S K, Almenara, J M, Artigau, E, Barragán, O, Barros, S C C, Bouchy, F, Cabrera, J, Caldwell, D A, Charbonneau, D, Chaturvedi, P, Cochran, W D, Csizmadia, S, Damasso, M, Delfosse, X, De Medeiros, J R, Díaz, R F, Doyon, R, Esposito, M, Furész, G, Figueira, P, Georgieva, I, Goffo, E, Grziwa, S, Guenther, E, Hatzes, A P, Jenkins, J M, Kabath, P, Knudstrup, E, Latham, D W, Lavie, B, Lovis, C, Mennickent, R E, Mullally, S E, Murgas, F, Narita, N, Pepe, F A, Persson, C M, Redfield, S, Ricker, G R, Santos, N C, Seager, S, Serrano, L M, Smith, A M S, Mascareño, A S, Subjak, J, Twicken, J D, Udry, S, Vanderspek, R & Zapatero Osorio, M R 2021, ' Masses and compositions of three small planets orbiting the nearby M dwarf L231-32 (TOI-270) and the M dwarf radius valley ', Monthly Notices of the Royal Astronomical Society, vol. 507, no. 2, pp. 2154-2173 . https://doi.org/10.1093/mnras/stab2143
Monthly Notices of the Royal Astronomical Society, 507(2), 2154-2173
Vincent, V E, Astudillo-Defru, N, Bonfils, X, Hirano, T, Luque, R, Lam, K W, Justesen, A B, Winn, J N, Gandolfi, D, Nowak, G, Palle, E, Albrecht, S, Dai, F, Campos Estrada, B, Owen, J E, Foreman-Mackey, D, Fridlund, M, Korth, J & Mathur, S 2021, ' Masses and compositions of three small planets orbiting the nearby M dwarf L231-32 (TOI-270) and the M dwarf radius valley ', Monthly Notices of the Royal Astronomical Society, vol. 507, no. 2, pp. 2154-2173 . https://doi.org/10.1093/mnras/stab2143

We report on precise Doppler measurements of L231-32 (TOI-270), a nearby M dwarf ($d=22$ pc, $M_\star = 0.39$ M$_\odot$, $R_\star = 0.38$ R$_\odot$), which hosts three transiting planets that were recently discovered using data from the Transiting Ex

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ab7ea93c67347fffdd9c13396a06b4b4
https://resolver.caltech.edu/CaltechAUTHORS:20211105-215008827

TOI-269 b: an eccentric sub-Neptune transiting a M2 dwarf revisited with ExTrA

Autor: Sara Seager, Eric B. Ting, Felipe Murgas, Nicholas M. Law, D. Maurel, S. Curaba, Tianjun Gan, S. Rochat, Richard G. West, George R. Ricker, Francesco Pepe, René Doyon, P. Kern, Coel Hellier, Jon M. Jenkins, Thibaut Moulin, I. C. Leão, G. Gaisne, Caroline Dorn, Xavier Bonfils, Laurent Jocou, Yves Magnard, J.-J. Correia, Eric Stadler, P. Rabou, C. Melo, Joshua N. Winn, C. Ziegler, J. D. Twicken, C. Lovis, Karen A. Collins, Nicola Astudillo-Defru, B. L. Canto Martins, Aurélien Wyttenbach, X. Delfosse, Alain Roux, Kevin I. Collins, Alain Delboulbé, J. F. Otegi, David R. Anderson, Jose-Manuel Almenara, William Waalkes, Ravit Helled, Marion Cointepas, François Bouchy, J. R. De Medeiros, Roland Vanderspek, Étienne Artigau, David Charbonneau, Pedro Figueira, T. Forveille, David W. Latham, L. Gluck, David R. Rodriguez, Andrew W. Mann, A. Wunsche, S. Lafrasse, Nuno C. Santos, Damien Ségransan, Rodrigo F. Díaz, Stéphane Udry, Philippe Feautrier

Publikováno v: Astronomy and Astrophysics-A&A
Astronomy and Astrophysics-A&A, EDP Sciences, 2021, 650, pp.A145. ⟨10.1051/0004-6361/202140328⟩

We present the confirmation of a new sub-Neptune close to the transition between super-Earths and sub-Neptunes transiting the M2 dwarf TOI- 269 (TIC 220479565, V = 14.4 mag, J = 10.9 mag, Rstar = 0.40 Rsun, Mstar = 0.39 Msun, d = 57 pc). The exoplane

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2c95106a2632f3aecf581576a0871eb5
https://hal-insu.archives-ouvertes.fr/insu-03458413/document