Transiting exoplanets from the CoRoT space mission: XXIX. The hot Jupiters CoRoT-30 b and CoRoT-31 b
Artikel i vetenskaplig tidskrift, 2020

We report the discovery as well as the orbital and physical characterizations of two new transiting giant exoplanets, CoRoT-30 b and CoRoT-31 b, with the CoRoT space telescope. Methods. We analyzed two complementary data sets: photometric transit light curves measured by CoRoT, and radial velocity curves measured by the HARPS spectrometer. To derive the absolute masses and radii of the planets, we modeled the stars from available magnitudes and spectra. Results. We find that CoRoT-30 b is a warm Jupiter on a close-to-circular 9.06-day orbit around a G3V star with a semi-major axis of about 0.08 AU. It has a radius of 1.01 ± 0.08 RJ, a mass of 2.90 ± 0.22 MJ, and therefore a mean density of 3.45 ± 0.65 g cm-3. The hot Jupiter CoRoT-31 b is on a close-to-circular 4.63-day orbit around a G2 IV star with a semi-major axis of about 0.05 AU. It has a radius of 1.46 ± 0.30 RJ, a mass of 0.84 ± 0.34 MJ, and therefore a mean density of 0.33 ± 0.18 g cm-3. Conclusions. Neither system seems to support the claim that stars hosting planets are more depleted in lithium. The radii of both planets are close to that of Jupiter, but they differ in mass; CoRoT-30 b is ten times denser than CoRoT-31 b. The core of CoRoT-30 b would weigh between 15 and 75 Earth masses, whereas relatively weak constraints favor no core for CoRoT-31 b. In terms of evolution, the characteristics of CoRoT-31 b appear to be compatible with the high-eccentricity migration scenario, which is not the case for CoRoT-30 b. The angular momentum of CoRoT-31 b is currently too low for the planet to evolve toward synchronization of its orbital revolution with stellar rotation, and the planet will slowly spiral-in while its host star becomes a red giant. CoRoT-30 b is not synchronized either: it looses angular momentum owing to stellar winds and is expected reach steady state in about 2 Gyr. CoRoT-30 and 31, as a pair, are a truly remarkable example of diversity in systems with hot Jupiters.

Planetary systems

Stars: individual: CoRoT-30

Stars: fundamental parameters

Stars: individual: CoRoT-31

Författare

P. Bordé

Université de Bordeaux

R. F. Díaz

Universidad de Buenos Aires

Universite de Geneve

O. Creevey

Institut d'Astrophysique Spatiale

Observatoire de la Cote d'Azur

C. Damiani

Institut d'Astrophysique Spatiale

Max-Planck-Gesellschaft

H. Deeg

Universidad de la Laguna

Instituto Astrofisico de Canarias

P. Klagyivik

Universidad de la Laguna

Instituto Astrofisico de Canarias

G. Wuchterl

Kuffner Observatory

D. Gandolfi

Landessternwarte Heidelberg-Königstuhl

Universita degli Studi di Torino

C.W.M. Fridlund

Universiteit Leiden

Chalmers, Rymd-, geo- och miljövetenskap, Onsala rymdobservatorium

Max-Planck-Gesellschaft

F. Bouchy

Universite de Geneve

Laboratoire d'Astrophysique de Marseille

S. Aigrain

University of Oxford

R. Alonso

Instituto Astrofisico de Canarias

Universidad de la Laguna

J. M. Almenara

Laboratoire d'Astrophysique de Marseille

Universite de Geneve

A. Baglin

LESIA - Laboratoire d'Etudes Spatiales et d'Instrumentation en Astrophysique

S.C.C. Barros

Laboratoire d'Astrophysique de Marseille

Universidade do Porto

A. S. Bonomo

Istituto nazionale di astrofisica (INAF)

J. Cabrera

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

Szilard Csizmadia

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

M. Deleuil

Laboratoire d'Astrophysique de Marseille

Anders Erikson

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

S. Ferraz-Mello

Universidade de Sao Paulo (USP)

E. W. Guenther

Thüringer Landessternwarte Tautenburg

T. Guillot

Observatoire de la Cote d'Azur

S. Grziwa

Universität zu Köln

A. Hatzes

Thüringer Landessternwarte Tautenburg

G. Hebrard

Institut d 'Astrophysique de Paris

T. Mazeh

Tel Aviv University

M. Ollivier

LESIA - Laboratoire d'Etudes Spatiales et d'Instrumentation en Astrophysique

Institut d'Astrophysique Spatiale

H. Parviainen

University of Oxford

Martin Pätzold

Universität zu Köln

H. Rauer

Technische Universität Berlin

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

D. Rouan

LESIA - Laboratoire d'Etudes Spatiales et d'Instrumentation en Astrophysique

A. Santerne

Laboratoire d'Astrophysique de Marseille

J. Schneider

LUTH - Laboratoire de l'Univers et de ses Theories

Astronomy and Astrophysics

0004-6361 (ISSN) 1432-0746 (eISSN)

Vol. 635 1732393

Ämneskategorier

Astronomi, astrofysik och kosmologi

Havs- och vattendragsteknik

Annan fysik

DOI

10.1051/0004-6361/201732393

Mer information

Senast uppdaterat

2020-05-12