J/A+A/703/A258 TOI-2449 b radial velocity curves (Ulmer-Moll+, 2025)
Detection and characterisation of a 106-day transiting Jupiter:
TOI-2449 b/NGTS-36 b.
Ulmer-Moll S., Gill S., Brahm R., Claringbold A., Lendl M., Al Moulla K.,
Anderson D., Battley M., Bayliss D., Bonfanti A., Bouchy F., Briceno C.,
Bryant E.M., Burleigh M.R., Collins K.A., Deline A., Dumusque X.,
Eberhardt J., Espinoza N., Falk B., Faria J.P., Fernandez Fernandez J.,
Figueira P., Fridlund M., Furlan E., Goad M.R., Goeke R.F., Hagelberg J.,
Hawthorn F., Helled R., Henning T., Hobson M., Howell S.B.,
Jafariyazani M., Jenkins J.M., Jenkins J.S., Jones M.I., Jordan A.,
Kendall A., Law N., Littlefield C., Mann A.W., McCormac J., Mordasini C.,
Moyano M., Osborn H., Pezzotti C., Psaridi A., Quinn S.N., Rodel T.,
Rodriguez J.E., Rojas F., Saha S., Schlecker M., Seager S., Sousa S.G.,
Tala Pinto M., Trifonov T., Udry S., Vines J.I., Viviani G., Watson C.A.,
Wheatley P.J., Wilson T.G., Winn J.N., Zhou G., Ziegler C.
<Astron. Astrophys. 703, A258 (2025)>
=2025A&A...703A.258U 2025A&A...703A.258U
ADC_Keywords: Stars, double and multiple ; Stars, dwarfs ; Exoplanets ;
Radial velocities ; Photometry ; Optical
Keywords: methods: data analysis - planets and satellites: detection -
planets and satellites: gaseous planets -
planets and satellites: individual: TOI-2449b
Abstract:
Only a handful of transiting giant exoplanets with orbital periods
longer than 100 days are known. These warm exoplanets are valuable
objects as their radius and mass can be measured leading to an
in-depth characterisation of the planet's properties. Thanks to low
levels of stellar irradiation and large orbital distances, the
atmospheric properties and orbital parameters of warm exoplanets
remain relatively unaltered by their host star, giving new insights
into planetary formation and evolution. We aim at extending the sample
of warm giant exoplanets with precise radii and masses. Our goal is to
identify suitable candidates in the Transiting Exoplanet Survey
Satellite (TESS) data and perform follow-up observations with
ground-based instruments. We use the Next Generation Transit Survey
(NGTS) to detect additional transits of planetary candidates in order
to pinpoint their orbital period. We also monitored the target with
several high-resolution spectrographs to measure the planetary mass
and eccentricity. We report the discovery of a 106-day period
Jupiter-sized planet around the G-type star TOI-2449/NGTS-36. We
jointly modelled the photometric and radial velocity data and find
that the planet has a mass of 0.70M{jup} and a radius of
1.002R{jup}. The planetary orbit has a semi-major axis of 0.449au
and is slightly eccentric. We detect an additional 3-year signal in
the radial velocity data likely due to the stellar magnetic cycle.
Based on the planetary evolution models considered here, we find that
TOI-2449 b/NGTS-36 b contains 11 Me of heavy elements and has a
marginal planet-to-star metal enrichment of 3.3. Assuming a
Jupiter-like Bond albedo, TOI-2449 b/NGTS-36 b has an equilibrium
temperature of 400K and is a good target for understanding nitrogen
chemistry in cooler atmospheres.
Description:
Radial velocity measurements of TOI-2449 taken with the
high-resolution spectrographs CHIRON, CORALIE, FEROS, and HARPS. Table
includes the date of observation, the radial velocity and its
associated error, and the spectrograph used to measure the radial
velocity.
Objects:
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RA (2000) DE Designation(s)
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04 31 56.24 -34 27 19.01 TOI-2449 = TIC 170729775
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 41 168 Radial velocities of TOI-2449
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 15 F15.7 d BJD Barycentric Julian date
17- 26 F10.7 km/s RV Radial velocity
28- 33 F6.4 km/s e_RV Radial velocity error
35- 41 A7 --- Inst Name of the instrument
(CHIRON, CORALIE, FEROS or HARPS)
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Acknowledgements:
Solene Ulmer-Moll, ulmer-moll(at)strw.leidenuniv.nl
(End) Patricia Vannier [CDS] 29-Sep-2025