Adibekyan, Vardan

Aguirre, Víctor Silva

Antia, H. M.

Ball, Warrick

Basu, Sarbani

Bean, Jacob L.

Bedding, Timothy R.

Bossini, Diego

Campante, Tiago L.

Chaplin, William J.

Christensen-Dalsgaard, Jørgen

Corsaro, Enrico

Cunha, Margarida S.

Davies, Guy R.

García, Rafael A.

Handberg, Rasmus

Hon, Marc

Huber, Daniel

Kane, Stephen R.

Kawaler, Steven D.

Kjeldsen, Hans

Kuszlewicz, James S.

Lucas, Miles

Lund, Mikkel N.

Mathur, Savita

Mena, Elisa Delgado

Metcalfe, Travis S.

Miglio, Andrea

Monteiro, Mário J. P. F. G.

Mosser, Benoît

Nardetto, Nicolas

Nielsen, Martin B.

Nsamba, Benard

Pereira, Filipe

Pinsonneault, Marc H.

Reffert, Sabine

Serenelli, Aldo M.

Sousa, Sérgio G.

Stassun, Keivan G.

Stello, Dennis

Stock, Stephan

Tsantaki, Maria

Turnbull, Margaret C.

Veras, Dimitri

Vrard, Mathieu

Yıldız, Mutlu

Çelik Orhan, Zeynep

Örtel, Sibel

The Astrophysical Journal

English

arXiv

Campante, Tiago

Lund, Mikkel

Mosser, Benoit

Serenelli, Aldo

Antia, H.

Bedding, Timothy,

Davies, Guy

García, Rafael

Kane, Stephen

Kawaler, Steven

Kuszlewicz, James,

Nielsen, Martin

Pinsonneault, Marc

Aguirre, Victor Silva

Stassun, Keivan

Chaplin, William

Bean, Jacob

Cunha, Margarida

Metcalfe, Travis

Monteiro, Mário

Sousa, Sérgio

Turnbull, Margaret

HAL Descartes

TESS Asteroseismology of the Known Red-giant Host Stars HD 212771 and HD 203949

Bedding, Timothy, R

Kuszlewicz, James, D

Yildiz, Mutlu

HAL: Hyper Article en Ligne

The Transiting Exoplanet Survey Satellite (TESS) is performing a near all-sky survey for planets that transit bright stars. In addition, its excellent photometric precision enables asteroseismology of solar-type and red-giant stars, which exhibit convection-driven, solar-like oscillations. Simulations predict that TESS will detect solar-like oscillations in nearly 100 stars already known to host planets. In this paper, we present an asteroseismic analysis of the known red-giant host stars HD 212771 and HD 203949, both systems having a long-period planet detected through radial velocities. These are the first detections of oscillations in previously known exoplanet-host stars by TESS, further showcasing the mission's potential to conduct asteroseismology of red-giant stars. We estimate the fundamental properties of both stars through a grid-based modeling approach that uses global asteroseismic parameters as input. We discuss the evolutionary state of HD 203949 in depth and note the large discrepancy between its asteroseismic mass ($M_\ast = 1.23 \pm 0.15\,{\rm M}_\odot$ if on the red-giant branch or $M_\ast = 1.00 \pm 0.16\,{\rm M}_\odot$ if in the clump) and the mass quoted in the discovery paper ($M_\ast = 2.1 \pm 0.1\,{\rm M}_\odot$), implying a change $&gt;30\,\%$ in the planet's mass. Assuming HD 203949 to be in the clump, we investigate the planet's past orbital evolution and discuss how it could have avoided engulfment at the tip of the red-giant branch. Finally, HD 212771 was observed by K2 during its Campaign 3, thus allowing for a preliminary comparison of the asteroseismic performances of TESS and K2. We estimate the ratio of the observed oscillation amplitudes for this star to be $A_{\rm max}^{\rm TESS}/A_{\rm max}^{\rm K2} = 0.75 \pm 0.14$, consistent with the expected ratio of $\sim0.85$ due to the redder bandpass of TESS

Orhan, Zeynep Çelik

University of Birmingham Research Portal

TESS Asteroseismology of the known red-giant host stars HD 212771 and HD 203949

Hal-Diderot

Archive Ouverte en Sciences de l'Information et de la Communication

The Transiting Exoplanet Survey Satellite (TESS) is performing a near all-sky survey for planets that transit bright stars. In addition, its excellent photometric precision enables asteroseismology of solar-type and red-giant stars, which exhibit convection-driven, solar-like oscillations. Simulations predict that TESS will detect solar-like oscillations in nearly 100 stars already known to host planets. In this paper, we present an asteroseismic analysis of the known red-giant host stars HD 212771 and HD 203949, both systems having a long-period planet detected through radial velocities. These are the first detections of oscillations in previously known exoplanet-host stars by TESS, further showcasing the mission’s potential to conduct asteroseismology of red-giant stars. We estimate the fundamental properties of both stars through a grid-based modeling approach that uses global asteroseismic parameters as input. We discuss the evolutionary state of HD 203949 in depth and note the large discrepancy between its asteroseismic mass (M * = 1.23 ± 0.15 M ☉ if on the red-giant branch or M * = 1.00 ± 0.16 M ☉ if in the clump) and the mass quoted in the discovery paper (M * = 2.1 ± 0.1 M ☉), implying a change >30% in the planet’s mass. Assuming HD 203949 to be in the clump, we investigate the planet’s past orbital evolution and discuss how it could have avoided engulfment at the tip of the red-giant branch. Finally, HD 212771 was observed by K2 during its Campaign 3, thus allowing for a preliminary comparison of the asteroseismic performances of TESS and K2. We estimate the ratio of the observed oscillation amplitudes for this star to be {A}\max {TESS}/{A}\max K2=0.75+/- 0.14, consistent with the expected ratio of ∼0.85 due to the redder bandpass of TESS

CORSARO, ENRICO MARIA NICOLA

BOSSINI, DIEGO

Delgado Mena, Elisa

Silva Aguirre, Víctor

MIGLIO, ANDREA

TSANTAKI, MARIA

OA@INAF - Istituto Nazionale di Astrofisica

HAL-CEA

https://openaccess.inaf.it/bitstream/20.500.12386/29992/1/Campante_2019_ApJ_885_31.pdf

TESS asteroseismology of the known red-giant host stars HD 212771 and HD 203949

TESS asteroseismology of the known red-giant host stars HD 212771 and HD 203949

Abstract

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HAL Descartes

HAL: Hyper Article en Ligne

University of Birmingham Research Portal

Hal-Diderot

Archive Ouverte en Sciences de l'Information et de la Communication

OA@INAF - Istituto Nazionale di Astrofisica

HAL-CEA

University of Birmingham Research Portal