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HD 20329b : An ultra-short-period planet around a solar-type star found by TESS

Murgas, F. ; Nowak, G. ; Masseron, T. ; Parviainen, H. ; Luque, R. ; Pallé, E. ; Korth, J. LU ; Carleo, I. ; Csizmadia, Sz. and Esparza-Borges, E. , et al. (2022) In Astronomy and Astrophysics 668.
Abstract

Context. Ultra-short-period (USP) planets are defined as
planets with orbital periods shorter than one day. This type of planets
is rare, highly irradiated, and interesting because their formation
history is unknown.


Aims. We aim to obtain precise mass and radius measurements to
confirm the planetary nature of a USP candidate found by the Transiting
Exoplanet Survey Satellite (TESS). These parameters can provide
insights into the bulk composition of the planet candidate and help to
place constraints on its formation history.


Methods. We used TESS light curves and HARPS-N spectrograph
radial velocity measurements to establish the physical properties of... (More)

Context. Ultra-short-period (USP) planets are defined as
planets with orbital periods shorter than one day. This type of planets
is rare, highly irradiated, and interesting because their formation
history is unknown.


Aims. We aim to obtain precise mass and radius measurements to
confirm the planetary nature of a USP candidate found by the Transiting
Exoplanet Survey Satellite (TESS). These parameters can provide
insights into the bulk composition of the planet candidate and help to
place constraints on its formation history.


Methods. We used TESS light curves and HARPS-N spectrograph
radial velocity measurements to establish the physical properties of the
transiting exoplanet candidate found around the star HD 20329
(TOI-4524). We performed a joint fit of the light curves and radial
velocity time series to measure the mass, radius, and orbital parameters
of the candidate.


Results. We confirm and characterize HD 20329b, a USP planet transiting a solar-type star. The host star (HD 20329, V = 8.74 mag, J = 7.5 mag) is characterized by its G5 spectral type with M* = 0.90 ± 0.05 M⊙, R* = 1.13 ± 0.02 R⊙, and Teff = 5596 ± 50 K; it is located at a distance d
= 63.68 ± 0.29 pc. By jointly fitting the available TESS transit light
curves and follow-up radial velocity measurements, we find an orbital
period of 0.9261 ± (0.5 × 10−4) days, a planetary radius of 1.72 ± 0.07 R⊗, and a mass of 7.42 ± 1.09 M⊗, implying a mean density of ρp = 8.06 ± 1.53 g cm−3. HD 20329b joins the ~30 currently known USP planets with radius and Doppler mass measurements.

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publishing date
type
Contribution to journal
publication status
published
subject
keywords
Planets and satellites: detection, Techniques: photometric, Techniques: radial velocities
in
Astronomy and Astrophysics
volume
668
article number
A158
pages
20 pages
publisher
EDP Sciences
external identifiers
  • scopus:85145440978
ISSN
0004-6361
DOI
10.1051/0004-6361/202244459
language
English
LU publication?
no
additional info
Publisher Copyright: © 2022 EDP Sciences. All rights reserved.
id
fb3ddc5b-05ed-4aac-80a3-c49308257498
date added to LUP
2023-01-17 09:08:04
date last changed
2023-01-25 11:25:03
@article{fb3ddc5b-05ed-4aac-80a3-c49308257498,
  abstract     = {{<p><i>Context.</i> Ultra-short-period (USP) planets are defined as <br>
planets with orbital periods shorter than one day. This type of planets <br>
is rare, highly irradiated, and interesting because their formation <br>
history is unknown.</p><br>
<p><i>Aims.</i> We aim to obtain precise mass and radius measurements to<br>
 confirm the planetary nature of a USP candidate found by the Transiting<br>
 Exoplanet Survey Satellite (TESS). These parameters can provide <br>
insights into the bulk composition of the planet candidate and help to <br>
place constraints on its formation history.</p><br>
<p><i>Methods.</i> We used TESS light curves and HARPS-N spectrograph <br>
radial velocity measurements to establish the physical properties of the<br>
 transiting exoplanet candidate found around the star HD 20329 <br>
(TOI-4524). We performed a joint fit of the light curves and radial <br>
velocity time series to measure the mass, radius, and orbital parameters<br>
 of the candidate.</p><br>
<p><i>Results.</i> We confirm and characterize HD 20329b, a USP planet transiting a solar-type star. The host star (HD 20329, <i>V</i> = 8.74 mag, <i>J</i> = 7.5 mag) is characterized by its G5 spectral type with <i>M</i><sub>*</sub> = 0.90 ± 0.05 <i>M</i><sub>⊙</sub>, <i>R</i><sub>*</sub> = 1.13 ± 0.02 <i>R</i><sub>⊙</sub>, and <i>T</i><sub>eff</sub> = 5596 ± 50 K; it is located at a distance <i>d</i><br>
 = 63.68 ± 0.29 pc. By jointly fitting the available TESS transit light <br>
curves and follow-up radial velocity measurements, we find an orbital <br>
period of 0.9261 ± (0.5 × 10<sup>−4</sup>) days, a planetary radius of 1.72 ± 0.07 <i>R</i><sub>⊗</sub>, and a mass of 7.42 ± 1.09 <i>M</i><sub>⊗</sub>, implying a mean density of <i>ρ</i><sub>p</sub> = 8.06 ± 1.53 g cm<sup>−3</sup>. HD 20329b joins the ~30 currently known USP planets with radius and Doppler mass measurements.</p>}},
  author       = {{Murgas, F. and Nowak, G. and Masseron, T. and Parviainen, H. and Luque, R. and Pallé, E. and Korth, J. and Carleo, I. and Csizmadia, Sz. and Esparza-Borges, E. and Alqasim, A. and Cochran, W. D. and Dai, F. and Deeg, H. J. and Gandolfi, D. and Goffo, E. and Kabáth, P. and Lam, K. W. F. and Livingston, J. and Muresan, A. and Osborne, H. L. M. and Persson, C. M. and Serrano, L. M. and Smith, A. M. S. and Van Eylen, V. and Orell-Miquel, J. and Hinkel, N. R. and Galán, D. and Puig-Subirà, M. and Stangret, M. and Fukui, A. and Kagetani, T. and Narita, N. and Ciardi, D. R. and Boyle, A. W. and Ziegler, C. and Briceño, C. and Law, N. and Mann, A. W. and Jenkins, J. M. and Latham, D. W. and Quinn, S. N. and Ricker, G. and Seager, S. and Shporer, A. and Ting, E. B. and Vanderspek, R. and Winn, J. N.}},
  issn         = {{0004-6361}},
  keywords     = {{Planets and satellites: detection; Techniques: photometric; Techniques: radial velocities}},
  language     = {{eng}},
  month        = {{12}},
  publisher    = {{EDP Sciences}},
  series       = {{Astronomy and Astrophysics}},
  title        = {{HD 20329b : An ultra-short-period planet around a solar-type star found by TESS}},
  url          = {{http://dx.doi.org/10.1051/0004-6361/202244459}},
  doi          = {{10.1051/0004-6361/202244459}},
  volume       = {{668}},
  year         = {{2022}},
}