Issue |
A&A
Volume 684, April 2024
|
|
---|---|---|
Article Number | A201 | |
Number of page(s) | 11 | |
Section | Planets and planetary systems | |
DOI | https://doi.org/10.1051/0004-6361/202347162 | |
Published online | 24 April 2024 |
NGTS discovery of a highly inflated Saturn-mass planet and a highly irradiated hot Jupiter
NGTS-26 b and NGTS-27 b★
1
Observatoire de Genève, Université de Genève,
Chemin Pegasi 51,
1290
Sauverny,
Switzerland
e-mail: francois.bouchy@unige.ch
2
Astrophysics Group, Cavendish Laboratory,
J.J. Thomson Avenue,
Cambridge
CB3 0HE,
UK
3
Astronomy Unit, Queen Mary University of London,
Mile End Road,
London
E1 4NS,
UK
4
Centre for Exoplanets and Habitability, University of Warwick,
Gibbet Hill Road,
Coventry
CV4 7AL,
UK
5
Department of Physics, University of Warwick,
Gibbet Hill Road,
Coventry
CV4 7AL,
UK
6
European Southern Observatory,
Karl-Schwarschild-Strasse 2,
85748
Garching,
Germany
7
Departamento de Astronomia, Universidad de Chile,
Casilla 36-D,
Santiago,
Chile
8
Instituto de Astronomía, Universidad Católica del Norte,
Angamos 0610,
1270709
Antofagasta,
Chile
9
Núcleo de Astronomica, Facultad de Ingeniería y Ciencias, Universidad Diego Portales,
Av. Ejército 441,
Santiago,
Chile
10
Centro de Astrofísica y Tecnologías Afines (CATA),
Casilla 36-D,
Santiago,
Chile
11
School of Physics and Astronomy, University of Leicester,
LE1 7RH,
UK
12
Mullard Space Science Laboratory, University College London,
Holmbury St Mary,
Dorking,
RH5 6NT,
UK
13
Aix Marseille Univ, CNRS, CNES, LAM,
13388
Marseille,
France
14
Center for Astronomy and Astrophysics, TU Berlin,
Hardenbergstr. 36,
10623
Berlin,
Germany
15
Department of Physics and Astronomy, University of California, Irvine,
4129 Frederick Reines Hall,
Irvine, CA
92697,
USA
16
Institute of Planetary Research, German Aerospace Center,
Rutherfordstrasse 2,
12489
Berlin,
Germany
17
European Space Agency (ESA), European Space Research and Technology Centre (ESTEC),
Keplerlaan 1,
2201 AZ
Noordwijk,
The Netherlands
18
Astrophysics Research Centre, School of Mathematics and Physics, Queen’s University Belfast,
Belfast
BT7 1NN,
UK
Received:
12
June
2023
Accepted:
5
January
2024
We report the discovery of two new transiting giant exoplanets NGTS-26 b and NGTS-27 b by the Next Generation Transit Survey (NGTS). NGTS-26 b orbits around a G6-type main sequence star every 4.52 days. It has a mass of 0.29-0.06+0.07 MJup and a radius of 1.33-0.05+0.06 RJup making it a Saturn-mass planet with a highly inflated radius. NGTS-27 b orbits around a slightly evolved G3-type star every 3.37 days. It has a mass of 0.59-0.07+0.10 MJup and a radius of 1.40±0.04 RJup, making it a relatively standard hot Jupiter. The transits of these two planetary systems were re-observed and confirmed in photometry by the SAAO 1.0-m telescope, 1.2-m Euler Swiss telescope as well as the TESS spacecraft, and their masses were derived spectroscopically by the CORALIE, FEROS and HARPS spectrographs. Both giant exoplanets are highly irradiated by their host stars and present an anomalously inflated radius, especially NGTS-26 b which is one of the largest objects among peers of similar mass.
Key words: techniques: photometric / planets and satellites: detection / planets and satellites: individual: NGTS-26 b / planets and satellites: individual: NGTS-27 b / planetary systems
Full Tables 1 and 3 are also available at the CDS via anonymous ftp to cdsarc.cds.unistra.fr (138.79.128.5) or via https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/684/A201
© The Authors 2024
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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