TOI-1670 b and c: An Inner Sub-Neptune with an Outer Warm Jupiter Unlikely to Have Originated from High-eccentricity Migration
Artikel i vetenskaplig tidskrift, 2022

We report the discovery of two transiting planets around the bright (V = 9.9 mag) main-sequence F7 star TOI-1670 by the Transiting Exoplanet Survey Satellite. TOI-1670 b is a sub-Neptune (R-b = 2.06(-0.15)(+0.19) R-circle plus) on a 10.9 day orbit, and TOI-1670 c is a warm Jupiter (R-c= 0.987(-0.025)(+0.025) R-Jup) on a 40.7 day orbit. Using radial velocity observations gathered with the Tull Coude Spectrograph on the Harlan J. Smith telescope and HARPS-N on the Telescopio Nazionale Galileo, we find a planet mass of M-c = 0.63(-0.08)(+0.09) M(Jup )for the outer warm Jupiter, implying a mean density of rho(c) = 0.81(-0.11)(+0.13) g cm(-3). The inner sub-Neptune is undetected in our radial velocity data (M-b < 0.13 M-Jup at the 99% confidence level). Multiplanet systems like TOI-1670 hosting an outer warm Jupiter on a nearly circular orbit (l(e) = 0.09(-0.04)(+0.05)) and one or more inner coplanar planets are more consistent with "gentle" formation mechanisms such as disk migration or in situ formation rather than high-eccentricity migration. Of the 11 known systems with a warm Jupiter and a smaller inner companion, eight (73%) are near a low-order mean-motion resonance, which can be a signature of migration. TOI-1670 joins two other systems (27% of this subsample) with period commensurabilities greater than 3, a common feature of in situ formation or halted inward migration. TOI-1670 and the handful of similar systems support a diversity of formation pathways for warm Jupiters.

Författare

Quang H. Tran

The University of Texas at Austin

Brendan P. Bowler

The University of Texas at Austin

Michael Endl

The University of Texas at Austin

William D. Cochran

The University of Texas at Austin

Phillip J. MacQueen

The University of Texas at Austin

Davide Gandolfi

Universita degli Studi di Torino

Carina Persson

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

Malcolm Fridlund

Universiteit Leiden

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

Enric Palle

Instituto de Astrofísica de Canarias

Universidad de la Laguna

Grzegorz Nowak

Universidad de la Laguna

Instituto de Astrofísica de Canarias

Hans J. Deeg

Instituto de Astrofísica de Canarias

Universidad de la Laguna

Rafael Luque

Instituto de Astrofisica de Andalucía (IAA)

John H. Livingston

University of Tokyo

Astrobiology Center, Japan

National Institutes of Natural Sciences

Petr Kabath

Czech Academy of Sciences

Marek Skarka

Masarykova Univerzita

Czech Academy of Sciences

Jan Subjak

Czech Academy of Sciences

Univerzita Karlova

Steve B. Howell

NASA Ames Research Center

Simon H. Albrecht

Aarhus Universitet

Karen A. Collins

Harvard-Smithsonian Center for Astrophysics

Massimiliano Esposito

Thüringer Landessternwarte Tautenburg

V. Van Eylen

University College London (UCL)

Sascha Grziwa

Universität zu Köln

Elisa Goffo

Universita degli Studi di Torino

Thüringer Landessternwarte Tautenburg

Chelsea X. Huang

Massachusetts Institute of Technology (MIT)

Jon M. Jenkins

NASA Ames Research Center

Marie Karjalainen

Czech Academy of Sciences

Raine Karjalainen

Czech Academy of Sciences

Emil Knudstrup

Aarhus Universitet

Judith Korth

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

Kristine W. F. Lam

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

David W. Latham

Harvard-Smithsonian Center for Astrophysics

Alan M. Levine

Massachusetts Institute of Technology (MIT)

H. L. M. Osborne

University College London (UCL)

Samuel N. Quinn

Harvard-Smithsonian Center for Astrophysics

Seth Redfield

Wesleyan University

George R. Ricker

Massachusetts Institute of Technology (MIT)

S. Seager

Massachusetts Institute of Technology (MIT)

Luisa Maria Serrano

Universita degli Studi di Torino

Alexis M. S. Smith

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

Joseph D. Twicken

SETI Institute

NASA Ames Research Center

Joshua N. Winn

Princeton University

Astronomical Journal

0004-6256 (ISSN) 1538-3881 (eISSN)

Vol. 163 5 225

Ämneskategorier

Astronomi, astrofysik och kosmologi

DOI

10.3847/1538-3881/ac5c4f

Mer information

Senast uppdaterat

2022-05-05