It Takes Two Planets in Resonance to Tango around K2-146
Artikel i vetenskaplig tidskrift, 2020

K2-146 is a cool, 0.358M dwarf that was found to host a mini-Neptune with a 2.67 day period. The planet exhibited strong transit timing variations (TTVs) of greater than 30 minutes, indicative of the presence of an additional object in the system. Here we report the discovery of the previously undetected outer planet in the system, K2-146 c, using additional photometric data. K2-146 c was found to have a grazing transit geometry and a 3.97 day period. The outer planet was only significantly detected in the latter K2 campaigns presumably because of precession of its orbital plane. The TTVs of K2-146 b and c were measured using observations spanning a baseline of almost 1200 days. We found strong anti -correlation in the TTVs, suggesting the two planets are gravitationally interacting. Our TTV and transit model analyses revealed that K2-146 b has a radius of 2.25 0.10 Re and a mass of 5.6 0.7 Me, whereas K2-146 c has a radius of 2.591 Re and a mass of 7.1 0.9 Me. The inner and outer planets likely have moderate eccentricities of e = 0.14 0.07 and 0.16 0.07, respectively. Long-term numerical integrations of the two -planet orbital solution show that it can be dynamically stable for at least 2 Myr. We show that the resonance angles of the planet pair are librating, which may be an indication that K2-146 b and c are in a 3:2 mean motion resonance. The orbital architecture of the system points to a possible convergent migration origin.

DYNAMICS

TERRESTRIAL PLANETS

MIGRATION

CURVES

ALGORITHM

SPECTRAL-ANALYSIS

SUPER-EARTHS

MASS

PHOTOMETRY

Författare

Kristine W. F. Lam

Technische Universität Berlin

Judith Korth

Universität zu Köln

Kento Masuda

Princeton University

Szilard Csizmadia

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

Philipp Eigmueller

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

Gumundur Kari Stefansson

Pennsylvania State University

Michael Endl

The University of Texas at Austin

Simon Albrecht

Aarhus Universitet

Paul Robertson

Pennsylvania State University

Rafael Luque

Instituto Astrofisico de Canarias

Universidad de la Laguna

John H. Livingston

University of Tokyo

Teruyuki Hirano

Tokyo Institute of Technology

Roi Alonso Sobrino

Instituto Astrofisico de Canarias

Universidad de la Laguna

Oscar Barragan

University of Oxford

Juan Cabrera

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

Ilaria Carleo

Wesleyan University

Alexander Chaushev

Technische Universität Berlin

William D. Cochran

The University of Texas at Austin

Fei Dai

Massachusetts Institute of Technology (MIT)

Princeton University

Jerome de Leon

University of Tokyo

Hans J. Deeg

Instituto Astrofisico de Canarias

Universidad de la Laguna

Anders Erikson

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

Massimiliano Esposito

Thüringer Landessternwarte Tautenburg

Technische Universität Berlin

Malcolm Fridlund

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

Akihiko Fukui

National Institutes of Natural Sciences

Davide Gandolfi

Universita degli Studi di Torino

Iskra Georgieva

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

Luca Gonzalez Cuesta

Universidad de la Laguna

Instituto Astrofisico de Canarias

Sascha Grziwa

Universität zu Köln

Eike W. Guenther

Thüringer Landessternwarte Tautenburg

Artie P. Hatzes

Thüringer Landessternwarte Tautenburg

Diego Hidalgo

Universidad de la Laguna

Instituto Astrofisico de Canarias

Maria Hjorth

Aarhus Universitet

Petr Kabath

Czech Academy of Sciences

Emil Knudstrup

Aarhus Universitet

Mikkel N. Lund

Aarhus Universitet

Suvrath Mahadevan

Ctr Exoplanets & Habitable Worlds

Penn State Astrobiol Res Ctr

Pennsylvania State University

Savita Mathur

Instituto Astrofisico de Canarias

Universidad de la Laguna

Pilar Montanes Rodriguez

Instituto Astrofisico de Canarias

Universidad de la Laguna

Felipe Murgas

Instituto Astrofisico de Canarias

Universidad de la Laguna

Norio Narita

Instituto Astrofisico de Canarias

Japan Science and Technology Agency

National Institutes of Natural Sciences

David Nespral

Instituto Astrofisico de Canarias

Universidad de la Laguna

Prajwal Niraula

MIT, Dept Earth Atmospher & Planetary Sci, 77 Massachusetts Ave

Enric Palle

Instituto Astrofisico de Canarias

Universidad de la Laguna

Martin Paetzold

Universität zu Köln

Carina M. Persson

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

Jorge Prieto-Arranz

Universidad de la Laguna

Instituto Astrofisico de Canarias

Heike Rauer

Technische Universität Berlin

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

FU Berlin

Seth Redfield

Wesleyan University

Ignasi Ribas

Consejo Superior de Investigaciones Científicas (CSIC)

Institut d'Estudis Espacials de Catalunya (IEEC)

Marek Skarka

Masarykova Univerzita

Czech Academy of Sciences

Alexis M. S. Smith

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

Jan Subjak

Czech Academy of Sciences

Charles Univ Prague

Vincent Van Eylen

Princeton University

University College London (UCL)

Astronomical Journal

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

Vol. 159 3 120

Ämneskategorier

Rymd- och flygteknik

Astronomi, astrofysik och kosmologi

Annan fysik

DOI

10.3847/1538-3881/ab66c9

Mer information

Senast uppdaterat

2020-09-04