---
_id: '11619'
abstract:
- lang: eng
  text: 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 M⊕, and a radius of Rc = 2.06 ± 0.03 R⊕. 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.
article_number: L10
article_processing_charge: No
article_type: letter_note
arxiv: 1
author:
- first_name: D.
  full_name: Gandolfi, D.
  last_name: Gandolfi
- first_name: O.
  full_name: Barragán, O.
  last_name: Barragán
- first_name: J. H.
  full_name: Livingston, J. H.
  last_name: Livingston
- first_name: M.
  full_name: Fridlund, M.
  last_name: Fridlund
- first_name: A. B.
  full_name: Justesen, A. B.
  last_name: Justesen
- first_name: S.
  full_name: Redfield, S.
  last_name: Redfield
- first_name: L.
  full_name: Fossati, L.
  last_name: Fossati
- first_name: S.
  full_name: Mathur, S.
  last_name: Mathur
- first_name: S.
  full_name: Grziwa, S.
  last_name: Grziwa
- first_name: J.
  full_name: Cabrera, J.
  last_name: Cabrera
- first_name: R. A.
  full_name: García, R. A.
  last_name: García
- first_name: C. M.
  full_name: Persson, C. M.
  last_name: Persson
- first_name: V.
  full_name: Van Eylen, V.
  last_name: Van Eylen
- first_name: A. P.
  full_name: Hatzes, A. P.
  last_name: Hatzes
- first_name: D.
  full_name: Hidalgo, D.
  last_name: Hidalgo
- first_name: S.
  full_name: Albrecht, S.
  last_name: Albrecht
- first_name: Lisa Annabelle
  full_name: Bugnet, Lisa Annabelle
  id: d9edb345-f866-11ec-9b37-d119b5234501
  last_name: Bugnet
  orcid: 0000-0003-0142-4000
- first_name: W. D.
  full_name: Cochran, W. D.
  last_name: Cochran
- first_name: Sz.
  full_name: Csizmadia, Sz.
  last_name: Csizmadia
- first_name: H.
  full_name: Deeg, H.
  last_name: Deeg
- first_name: Ph.
  full_name: Eigmüller, Ph.
  last_name: Eigmüller
- first_name: M.
  full_name: Endl, M.
  last_name: Endl
- first_name: A.
  full_name: Erikson, A.
  last_name: Erikson
- first_name: M.
  full_name: Esposito, M.
  last_name: Esposito
- first_name: E.
  full_name: Guenther, E.
  last_name: Guenther
- first_name: J.
  full_name: Korth, J.
  last_name: Korth
- first_name: R.
  full_name: Luque, R.
  last_name: Luque
- first_name: P.
  full_name: Montañes Rodríguez, P.
  last_name: Montañes Rodríguez
- first_name: D.
  full_name: Nespral, D.
  last_name: Nespral
- first_name: G.
  full_name: Nowak, G.
  last_name: Nowak
- first_name: M.
  full_name: Pätzold, M.
  last_name: Pätzold
- first_name: J.
  full_name: Prieto-Arranz, J.
  last_name: Prieto-Arranz
citation:
  ama: 'Gandolfi D, Barragán O, Livingston JH, et al. TESS’s first planet: A super-Earth
    transiting the naked-eye star π Mensae. <i>Astronomy &#38; Astrophysics</i>. 2018;619.
    doi:<a href="https://doi.org/10.1051/0004-6361/201834289">10.1051/0004-6361/201834289</a>'
  apa: 'Gandolfi, D., Barragán, O., Livingston, J. H., Fridlund, M., Justesen, A.
    B., Redfield, S., … Prieto-Arranz, J. (2018). TESS’s first planet: A super-Earth
    transiting the naked-eye star π Mensae. <i>Astronomy &#38; Astrophysics</i>. EDP
    Sciences. <a href="https://doi.org/10.1051/0004-6361/201834289">https://doi.org/10.1051/0004-6361/201834289</a>'
  chicago: 'Gandolfi, D., O. Barragán, J. H. Livingston, M. Fridlund, A. B. Justesen,
    S. Redfield, L. Fossati, et al. “TESS’s First Planet: A Super-Earth Transiting
    the Naked-Eye Star π Mensae.” <i>Astronomy &#38; Astrophysics</i>. EDP Sciences,
    2018. <a href="https://doi.org/10.1051/0004-6361/201834289">https://doi.org/10.1051/0004-6361/201834289</a>.'
  ieee: 'D. Gandolfi <i>et al.</i>, “TESS’s first planet: A super-Earth transiting
    the naked-eye star π Mensae,” <i>Astronomy &#38; Astrophysics</i>, vol. 619. EDP
    Sciences, 2018.'
  ista: 'Gandolfi D, Barragán O, Livingston JH, Fridlund M, Justesen AB, Redfield
    S, Fossati L, Mathur S, Grziwa S, Cabrera J, García RA, Persson CM, Van Eylen
    V, Hatzes AP, Hidalgo D, Albrecht S, Bugnet LA, Cochran WD, Csizmadia S, Deeg
    H, Eigmüller P, Endl M, Erikson A, Esposito M, Guenther E, Korth J, Luque R, Montañes
    Rodríguez P, Nespral D, Nowak G, Pätzold M, Prieto-Arranz J. 2018. TESS’s first
    planet: A super-Earth transiting the naked-eye star π Mensae. Astronomy &#38;
    Astrophysics. 619, L10.'
  mla: 'Gandolfi, D., et al. “TESS’s First Planet: A Super-Earth Transiting the Naked-Eye
    Star π Mensae.” <i>Astronomy &#38; Astrophysics</i>, vol. 619, L10, EDP Sciences,
    2018, doi:<a href="https://doi.org/10.1051/0004-6361/201834289">10.1051/0004-6361/201834289</a>.'
  short: D. Gandolfi, O. Barragán, J.H. Livingston, M. Fridlund, A.B. Justesen, S.
    Redfield, L. Fossati, S. Mathur, S. Grziwa, J. Cabrera, R.A. García, C.M. Persson,
    V. Van Eylen, A.P. Hatzes, D. Hidalgo, S. Albrecht, L.A. Bugnet, W.D. Cochran,
    S. Csizmadia, H. Deeg, P. Eigmüller, M. Endl, A. Erikson, M. Esposito, E. Guenther,
    J. Korth, R. Luque, P. Montañes Rodríguez, D. Nespral, G. Nowak, M. Pätzold, J.
    Prieto-Arranz, Astronomy &#38; Astrophysics 619 (2018).
date_created: 2022-07-18T14:41:16Z
date_published: 2018-11-22T00:00:00Z
date_updated: 2022-08-22T07:43:29Z
day: '22'
doi: 10.1051/0004-6361/201834289
extern: '1'
external_id:
  arxiv:
  - '1809.07573'
intvolume: '       619'
keyword:
- Space and Planetary Science
- Astronomy and Astrophysics
- planetary systems / planets and satellites
- detection / planets and satellites
- fundamental parameters / planets and satellites
- terrestrial planets / stars
- fundamental parameters
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://arxiv.org/abs/1809.07573
month: '11'
oa: 1
oa_version: Preprint
publication: Astronomy & Astrophysics
publication_identifier:
  eissn:
  - 1432-0746
  issn:
  - 0004-6361
publication_status: published
publisher: EDP Sciences
quality_controlled: '1'
scopus_import: '1'
status: public
title: 'TESS’s first planet: A super-Earth transiting the naked-eye star π Mensae'
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 619
year: '2018'
...