TESS's first planet: A super-Earth transiting the naked-eye star π Mensae
Artikel i vetenskaplig tidskrift, 2018

We report on the confirmation and mass determination of π Men c, the first transiting planet discovered by NASA's TESS space mission. π Men is a naked-eye (V = 5.65 mag), quiet G0 V star that was previously known to host a sub-stellar companion (π Men b) on a longperiod (Porb = 2091 days), eccentric (e = 0.64) orbit. Using TESS time-series photometry, combined with Gaia data, published UCLES at AAT Doppler measurements, and archival HARPS at ESO-3.6m radial velocities, we found that π Men c is a close-in planet with an orbital period of Porb = 6.27 days, a mass of Mc = 4.52 ± 0.81 Mo, and a radius of Rc = 2.06 ± 0.03 Ro. Based on the planet's orbital period and size, π Men c is a super-Earth located at, or close to, the radius gap, while its mass and bulk density suggest it may have held on to a significant atmosphere. Because of the brightness of the host star, this system is highly suitable for a wide range of further studies to characterize the planetary atmosphere and dynamical properties. We also performed an asteroseismic analysis of the TESS data and detected a hint of power excess consistent with the seismic values expected for this star, although this result depends on the photometric aperture used to extract the light curve. This marginal detection is expected from pre-launch simulations hinting at the asteroseismic potential of the TESS mission for longer, multi-sector observations and/or for more evolved bright stars.

Planets and satellites: terrestrial planets

Stars: fundamental parameters

Planetary systems

Planets and satellites: fundamental parameters

Planets and satellites: detection

Författare

D. Gandolfi

Universita degli Studi di Torino

O. Barragán

Universita degli Studi di Torino

J.H. Livingston

University of Tokyo

Malcolm Fridlund

Universiteit Leiden

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

A.B. Justesen

Aarhus Universitet

S. Redfield

Wesleyan University Middletown

L. Fossati

Institut fur Weltraumforschung

S. Mathur

Universidad de la Laguna

Instituto Astrofisico de Canarias

S. Grziwa

Universität zu Köln

J. Cabrera

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

R. A. García

Université Paris Diderot

Université Paris-Saclay

Carina Persson

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

Vincent Van Eylen

Princeton University

A. Hatzes

Thüringer Landessternwarte Tautenburg

D. Hidalgo

Instituto Astrofisico de Canarias

Universidad de la Laguna

Simon Albrecht

Aarhus Universitet

L. Bugnet

Université Paris Diderot

Université Paris-Saclay

William D. Cochran

The University of Texas at Austin

Szilard Csizmadia

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

H. Deeg

Instituto Astrofisico de Canarias

Universidad de la Laguna

P. Eigmüller

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

M. Endl

The University of Texas at Austin

Anders Erikson

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

M. Esposito

Thüringer Landessternwarte Tautenburg

E. W. Guenther

Thüringer Landessternwarte Tautenburg

Judith Korth

Universität zu Köln

R. Luque

Universidad de la Laguna

Instituto Astrofisico de Canarias

P. M. Rodriguez

Instituto Astrofisico de Canarias

Universidad de la Laguna

David Nespral

Universidad de la Laguna

Instituto Astrofisico de Canarias

G. Nowak

Instituto Astrofisico de Canarias

Universidad de la Laguna

Martin Pätzold

Universität zu Köln

J. Prieto-Arranz

Universidad de la Laguna

Instituto Astrofisico de Canarias

Astronomy and Astrophysics

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

Vol. 619 L10

Ämneskategorier

Astronomi, astrofysik och kosmologi

Fundament

Grundläggande vetenskaper

DOI

10.1051/0004-6361/201834289

Mer information

Senast uppdaterat

2018-12-12