Hot planets around cool stars - two short-period mini-Neptunes transiting the late K-dwarf TOI-1260
Artikel i vetenskaplig tidskrift, 2021

We present the discovery and characterization of two sub-Neptunes in close orbits, as well as a tentative outer planet of a similar size, orbiting TOI-1260 - a low metallicity K6V dwarf star. Photometry from Transiting Exoplanet Survey Satellite(TESS) yields radii of R-b = 2.33 +/- 0.10 and R-c = 2.82 +/- 0.15 R-circle plus, and periods of 3.13 and 7.49 d for TOI-1260b and TOI-1260c, respectively. We combined the TESS data with a series of ground-based follow-up observations to characterize the planetary system. From HARPS-N high-precision radial velocities we obtain M-b = and M-c = M-circle plus. The star is moderately active with a complex activity pattern, which necessitated the use of Gaussian process regression for both the light-curve detrending and the radial velocity modelling, in the latter case guided by suitable activity indicators. We successfully disentangle the stellar-induced signal from the planetary signals, underlining the importance and usefulness of the Gaussian process approach. We test the system's stability against atmospheric photoevaporation and find that the TOI-1260 planets are classic examples of the structure and composition ambiguity typical for the 2-3 R-circle plus range.

planets and satellites: individual: TOI-1260b, c

stars: low-mass

techniques: radial velocities

techniques: photometric

planets and satellites: composition

planetary systems

planets and satellites: atmospheres

Författare

Iskra Georgieva

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

Carina Persson

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

O. Barragan

University of Oxford

G. Nowak

Instituto de Astrofísica de Canarias

Universidad de la Laguna

Malcolm Fridlund

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

D. Locci

Osservatorio Astronomico di Palermo Guiseppe S. Vaiana

E. Palle

Instituto de Astrofísica de Canarias

Universidad de la Laguna

R. Luque

Instituto de Astrofísica de Canarias

Universidad de la Laguna

I Carleo

Wesleyan University

D. Gandolfi

Universita degli Studi di Torino

S. R. Kane

University of California at Riverside

Judith Korth

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

K. G. Stassun

Vanderbilt University

J.H. Livingston

University of Tokyo

E. C. Matthews

Université de Genève

Massachusetts Institute of Technology (MIT)

K. A. Collins

Harvard-Smithsonian Center for Astrophysics

S. B. Howell

NASA Ames Research Center

L. M. Serrano

Universita degli Studi di Torino

S. Albrecht

Aarhus Universitet

Nordic Optical Telescope

A. Bieryla

Harvard-Smithsonian Center for Astrophysics

C. E. Brasseur

Space Telescope Science Institute (STScI)

D. Ciardi

California Institute of Technology (Caltech)

W. D. Cochran

The University of Texas at Austin

K. D. Colon

NASA Goddard Space Flight Center

I. J. M. Crossfield

University of Kansas

Sz Csizmadia

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

H. J. Deeg

Instituto de Astrofísica de Canarias

Universidad de la Laguna

M. Esposito

Thüringer Landessternwarte Tautenburg

E. Furlan

California Institute of Technology (Caltech)

T. Gan

Tsinghua University

E. Goffo

Universita degli Studi di Torino

E. Gonzales

University of California at Santa Cruz

S. Grziwa

Universität zu Köln

E. W. Guenther

Thüringer Landessternwarte Tautenburg

P. Guerra

Observatori Astronòmic Albanya&grave

T. Hirano

National Institutes of Natural Sciences

J. M. Jenkins

NASA Ames Research Center

E. L. N. Jensen

Swarthmore College

P. Kabath

Astron Inst ASCR

E. Knudstrup

Nordic Optical Telescope

Aarhus Universitet

K. W. F. Lam

Technische Universität Berlin

D. W. Latham

Harvard-Smithsonian Center for Astrophysics

R. A. Matson

US Naval Observatory

H. L. M. Osborne

University College London (UCL)

S. McDermott

Protologic LLC

M. Paegert

Harvard-Smithsonian Center for Astrophysics

S. N. Quinn

Harvard-Smithsonian Center for Astrophysics

S. Redfield

Wesleyan University

G. R. Ricker

Massachusetts Institute of Technology (MIT)

J. E. Schlieder

NASA Goddard Space Flight Center

N. J. Scott

NASA Ames Research Center

S. Seager

Massachusetts Institute of Technology (MIT)

A. M. S. Smith

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

P. Tenenbaum

NASA Ames Research Center

SETI Institute

J. D. Twicken

SETI Institute

NASA Ames Research Center

R. Vanderspek

Massachusetts Institute of Technology (MIT)

V. Van Eylen

University College London (UCL)

J. N. Winn

Princeton University

Monthly Notices of the Royal Astronomical Society

0035-8711 (ISSN) 1365-2966 (eISSN)

Vol. 505 4 4684-4701

Ämneskategorier

Astronomi, astrofysik och kosmologi

Annan kemi

Sannolikhetsteori och statistik

DOI

10.1093/mnras/stab1464

Mer information

Senast uppdaterat

2021-10-14