Precise mass and radius of a transiting super-Earth planet orbiting the M dwarf TOI-1235: a planet in the radius gap?
Artikel i vetenskaplig tidskrift, 2020

We report the confirmation of a transiting planet around the bright weakly active M0.5 V star TOI-1235 (TYC 4384-1735-1, V ≈ 11.5 mag), whose transit signal was detected in the photometric time series of sectors 14, 20, and 21 of the TESS space mission. We confirm the planetary nature of the transit signal, which has a period of 3.44 d, by using precise RV measurements with the CARMENES, HARPS-N, and iSHELL spectrographs, supplemented by high-resolution imaging and ground-based photometry. A comparison of the properties derived for TOI-1235 b with theoretical models reveals that the planet has a rocky composition, with a bulk density slightly higher than that of Earth. In particular, we measure a mass of Mp = 5.9 ± 0.6 M⊕ and a radius of Rp = 1.69 ± 0.08 R⊕, which together result in a density of ρp = 6.7- 1.1+ 1.3 g cm-3. When compared with other well-characterized exoplanetary systems, the particular combination of planetary radius and mass places our discovery in the radius gap, which is a transition region between rocky planets and planets with significant atmospheric envelopes. A few examples of planets occupying the radius gap are known to date. While the exact location of the radius gap for M dwarfs is still a matter of debate, our results constrain it to be located at around 1.7 R⊕ or larger at the insolation levels received by TOI-1235 b (~60 S⊕). This makes it an extremely interesting object for further studies of planet formation and atmospheric evolution.

stars: individual: TOI-1235

techniques: photometric

Astrophysics - Solar and Stellar Astrophysics

techniques: radial velocities

Astrophysics - Earth and Planetary Astrophysics

stars: late-type

Författare

P. Bluhm

R. Luque

N. Espinoza

E. Palle

J. A. Caballero

S. Dreizler

J. Livingston

S. Mathur

A. Quirrenbach

S. Stock

V. Van Eylen

G. Nowak

E. D. Lopez

Szilard Csizmadia

M. Zapatero-Osorio

P. Schöfer

J. Lillo-Box

M. Oshagh

E. González-Álvarez

P. J. Amado

D. Barrado

V. J. S. Bejar

B. Cale

P. Chaturvedi

C. Cifuentes

W. D. Cochran

K. I. Collins

M. Cortés-Contreras

E. Díez Alonso

M. El Mufti

A. Ercolino

Malcolm Fridlund

Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik, Galaktisk astrofysik

E. Gaidos

R. A. Garcia

Iskra Georgieva

Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik, Galaktisk astrofysik

L. Gonzalez-Cuesta

P. Guerra

Artie P. Hatzes

Th Henning

E. Herrero

D. Hidalgo

G. Isopi

S. V. Jeffers

J. M. Jenkins

E. L. N. Jensen

P. Kabath

A. Kaminski

J. Kemmer

J. Korth

D. Kossakowski

M. Kürster

M. Lafarga

F. Mallia

D. Montes

J. C. Morales

M. Morales-Calderon

F. Murgas

N. Narita

V. M. Passegger

S. Pedraz

Carina Persson

Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik, Galaktisk astrofysik

P. Plavchan

H. Rauer

S. Redfield

S. Reffert

A. Reiners

I Ribas

G. Ricker

C. Rodíguez-López

A. R. G. Santos

S. Seager

M. Schlecker

A. Schweitzer

Y. Shan

M. G. Soto

J. Subjak

L. Tal-Or

T. Trifonov

S. Vanaverbeke

R. Vanderspek

J. Wittrock

M. Zechmeister

F. Zohrabi

Astronomy and Astrophysics

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

Vol. 639 132 17-

Exoplaneter från rymden - CHEOPS och PLATO

Rymdstyrelsen, 2017-01-01 -- 2022-12-31.

Ämneskategorier

Astronomi, astrofysik och kosmologi

Fundament

Grundläggande vetenskaper

DOI

10.1051/0004-6361/202038160

Mer information

Skapat

2020-07-30