K2-99 revisited: A non-inflated warm Jupiter, and a temperate giant planet on a 522-d orbit around a subgiant
Artikel i vetenskaplig tidskrift, 2022

We report new photometric and spectroscopic observations of the K2-99 planetary system. Asteroseismic analysis of the short-cadence light curve from K2's Campaign 17 allows us to refine the stellar properties. We find K2-99 to be significantly smaller than previously thought, with R = 2.55 ± 0.02 R. The new light curve also contains four transits of K2-99 b, which we use to improve our knowledge of the planetary properties. We find the planet to be a non-inflated warm Jupiter, with Rb = 1.06 ± 0.01 RJup. 60 new radial velocity measurements from HARPS, HARPS-N, and HIRES enable the determination of the orbital parameters of K2-99 c, which were previously poorly constrained. We find that this outer planet has a minimum mass Mcsin ic = 8.4 ± 0.2 MJup, and an eccentric orbit (ec = 0.210 ± 0.009) with a period of 522.2 ± 1.4 d. Upcoming TESS observations in 2022 have a good chance of detecting the transit of this planet, if the mutual inclination between the two planetary orbits is small.

Planets and satellites: Individual: K2-99 b

Planets and satellites: Individual: K2-99 c

Planetary systems

Planets and satellites: Detection

Författare

Alexis M. S. Smith

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

S. N. Breton

Université Paris-Saclay

Szilard Csizmadia

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

F. Dai

California Institute of Technology (Caltech)

D. Gandolfi

Universita degli Studi di Torino

R. A. García

Université Paris-Saclay

A. W. Howard

California Institute of Technology (Caltech)

H. Isaacson

University of California

Judith Korth

Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik, Astronomi och plasmafysik 2

K. W.F. Lam

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

Technische Universität Berlin

S. Mathur

Universidad de la Laguna

Instituto de Astrofísica de Canarias

G. Nowak

Instituto de Astrofísica de Canarias

Universidad de la Laguna

F. Pérez Hernández

Instituto de Astrofísica de Canarias

Universidad de la Laguna

Carina Persson

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

S. H. Albrecht

Aarhus Universitet

O. Barragán

University of Oxford

J. Cabrera

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

W. D. Cochran

The University of Texas at Austin

H. J. Deeg

Instituto de Astrofísica de Canarias

Universidad de la Laguna

Malcolm Fridlund

Universiteit Leiden

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

Iskra Georgieva

Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik, Astronomi och plasmafysik 2

E. Gof fo

Thüringer Landessternwarte Tautenburg

Universita degli Studi di Torino

E. W. Guenther

Thüringer Landessternwarte Tautenburg

A. Hatzes

Thüringer Landessternwarte Tautenburg

Petr Kabath

Czech Academy of Sciences

J. H. Livingston

University of Tokyo

R. Luque

Instituto de Astrofisica de Andalucía (IAA)

Enric Palle

Universidad de la Laguna

Instituto de Astrofísica de Canarias

S. Redfield

Wesleyan University

F. Rodler

European Southern Observatory Santiago

L. M. Serrano

Universita degli Studi di Torino

Vincent Van Eylen

University College London (UCL)

Monthly Notices of the Royal Astronomical Society

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

Vol. 510 4 5035-5049

Ämneskategorier

Astronomi, astrofysik och kosmologi

Atom- och molekylfysik och optik

Annan fysik

DOI

10.1093/mnras/stab3497

Mer information

Senast uppdaterat

2022-03-07