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TESS's first planet : A super-Earth transiting the naked-eye star π Mensae

Gandolfi, D. ; Barragán, O. ; Livingston, J. H. ; Fridlund, M. ; Justesen, A. B. ; Redfield, S. ; Fossati, L. ; Mathur, S. ; Grziwa, S. and Cabrera, J. , et al. (2018) In Astronomy and Astrophysics 619.
Abstract

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... (More)

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.

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publishing date
type
Contribution to journal
publication status
published
keywords
Planetary systems, Planets and satellites: detection, Planets and satellites: fundamental parameters, Planets and satellites: terrestrial planets, Stars: fundamental parameters
in
Astronomy and Astrophysics
volume
619
article number
L10
publisher
EDP Sciences
external identifiers
  • scopus:85057316432
ISSN
0004-6361
DOI
10.1051/0004-6361/201834289
language
English
LU publication?
no
additional info
Publisher Copyright: © ESO 2018.
id
522eded4-9854-43a8-a907-f6e5b2645c20
date added to LUP
2023-02-02 11:11:54
date last changed
2023-02-20 14:31:46
@article{522eded4-9854-43a8-a907-f6e5b2645c20,
  abstract     = {{<p>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 (P<sub>orb</sub> = 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 P<sub>orb</sub> = 6.27 days, a mass of M<sub>c</sub> = 4.52 ± 0.81 M<sub>o</sub>, and a radius of R<sub>c</sub> = 2.06 ± 0.03 R<sub>o</sub>. 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.</p>}},
  author       = {{Gandolfi, D. and Barragán, O. and Livingston, J. H. and Fridlund, M. and Justesen, A. B. and Redfield, S. and Fossati, L. and Mathur, S. and Grziwa, S. and Cabrera, J. and García, R. A. and Persson, C. M. and Van Eylen, V. and Hatzes, A. P. and Hidalgo, D. and Albrecht, S. and Bugnet, L. and Cochran, W. D. and Csizmadia, S. and Deeg, H. and Eigmüller, P. and Endl, M. and Erikson, A. and Esposito, M. and Guenther, E. and Korth, J. and Luque, R. and Montañes Rodríguez, P. and Nespral, D. and Nowak, G. and Pätzold, M. and Prieto-Arranz, J.}},
  issn         = {{0004-6361}},
  keywords     = {{Planetary systems; Planets and satellites: detection; Planets and satellites: fundamental parameters; Planets and satellites: terrestrial planets; Stars: fundamental parameters}},
  language     = {{eng}},
  month        = {{11}},
  publisher    = {{EDP Sciences}},
  series       = {{Astronomy and Astrophysics}},
  title        = {{TESS's first planet : A super-Earth transiting the naked-eye star π Mensae}},
  url          = {{http://dx.doi.org/10.1051/0004-6361/201834289}},
  doi          = {{10.1051/0004-6361/201834289}},
  volume       = {{619}},
  year         = {{2018}},
}