TESS Hunt for Young and Maturing Exoplanets (THYME). VI. An 11 Myr Giant Planet Transiting a Very-low-mass Star in Lower Centaurus Crux - Archive ouverte HAL Access content directly
Journal Articles The Astronomical Journal Year : 2022

TESS Hunt for Young and Maturing Exoplanets (THYME). VI. An 11 Myr Giant Planet Transiting a Very-low-mass Star in Lower Centaurus Crux

, , , , , , , , , , , , , , , , , , , , , , , , , , , , , , (1) , (1) , (1) , (1) , , , , , , , , , , , , , , , , ,
1
Andrew W. Mann
  • Function : Author
Mackenna L. Wood
  • Function : Author
Stephen P. Schmidt
  • Function : Author
Madyson G. Barber
  • Function : Author
James E. Owen
  • Function : Author
Benjamin M. Tofflemire
  • Function : Author
Elisabeth R. Newton
  • Function : Author
Eric E. Mamajek
  • Function : Author
Jonathan L. Bush
  • Function : Author
Gregory N. Mace
  • Function : Author
Adam L. Kraus
  • Function : Author
Pa Chia Thao
  • Function : Author
Andrew Vanderburg
Joe Llama
  • Function : Author
Christopher M. Johns-Krull
  • Function : Author
L. Prato
  • Function : Author
Asa G. Stahl
  • Function : Author
Shih-Yun Tang
Matthew J. Fields
  • Function : Author
Karen A. Collins
  • Function : Author
Kevin I. Collins
  • Function : Author
Tianjun Gan
Eric L. N. Jensen
  • Function : Author
Jacob Kamler
  • Function : Author
Richard P. Schwarz
  • Function : Author
Elise Furlan
Crystal L. Gnilka
  • Function : Author
Steve B. Howell
  • Function : Author
Kathryn V. Lester
  • Function : Author
Dylan A. Owens
  • Function : Author
Tristan Guillot
Amaury H. M. J. Triaud
  • Function : Author
Marshall C. Johnson
  • Function : Author
Reilly P. Milburn
  • Function : Author
Aaron C. Rizzuto
  • Function : Author
Samuel N. Quinn
  • Function : Author
Ronan Kerr
  • Function : Author
George R. Ricker
  • Function : Author
Roland Vanderspek
David W. Latham
  • Function : Author
Sara Seager
Joshua N. Winn
  • Function : Author
Jon M. Jenkins
  • Function : Author
Natalia M. Guerrero
  • Function : Author
Avi Shporer
Joshua E. Schlieder
  • Function : Author
Brian Mclean
Bill Wohler

Abstract

Mature super-Earths and sub-Neptunes are predicted to be ≃ Jovian radius when younger than 10 Myr. Thus, we expect to find 5-15 R planets around young stars even if their older counterparts harbor none. We report the discovery and validation of TOI 1227b, a 0.85 ± 0.05 R J (9.5 R ) planet transiting a very-low-mass star (0.170 ± 0.015 M ) every 27.4 days. TOI 1227's kinematics and strong lithium absorption confirm that it is a member of a previously discovered subgroup in the Lower Centaurus Crux OB association, which we designate the Musca group. We derive an age of 11 ± 2 Myr for Musca, based on lithium, rotation, and the color-magnitude diagram of Musca members. The TESS data and ground-based follow-up show a deep (2.5%) transit. We use multiwavelength transit observations and radial velocities from the IGRINS spectrograph to validate the signal as planetary in nature, and we obtain an upper limit on the planet mass of ≃0.5 M J. Because such large planets are exceptionally rare around mature low-mass stars, we suggest that TOI 1227b is still contracting and will eventually turn into one of the more common <5 R planets.
Fichier principal
Vignette du fichier
Mann_2022_AJ_163_156.pdf (16.64 Mo) Télécharger le fichier
Origin : Publisher files allowed on an open archive

Dates and versions

insu-03656907 , version 1 (02-05-2022)

Licence

Attribution - CC BY 4.0

Identifiers

Cite

Andrew W. Mann, Mackenna L. Wood, Stephen P. Schmidt, Madyson G. Barber, James E. Owen, et al.. TESS Hunt for Young and Maturing Exoplanets (THYME). VI. An 11 Myr Giant Planet Transiting a Very-low-mass Star in Lower Centaurus Crux. The Astronomical Journal, 2022, 163, ⟨10.3847/1538-3881/ac511d⟩. ⟨insu-03656907⟩
15 View
4 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More