J/A+A/706/A20 TOI-375 velocity and light curves (Reinarz+, 2026)
A transiting hot Jupiter with two outer siblings orbiting an intermediate-mass
post-main-sequence star.
Reinarz Y., Jones M.I., Brahm R., Espinoza N., Tala Pinto M., Trifonov T.,
Jordan A., Acuna-Aguirre L., Henning T., Rojas F.I., Ziegler C.,
Conti D.M., Briceno C., Law N., Mann A.W., Collins K.A., Irwin J.M.,
Charbonneau D.
<Astron. Astrophys. 706, A20 (2026)>
=2026A&A...706A..20R 2026A&A...706A..20R (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Exoplanets ; Photometry ;
Radial velocities ; Optical
Keywords: techniques: photometric - techniques: radial velocities -
planets and satellites: detection -
planets and satellites: gaseous planets -
planets and satellites: individual: TOI-375
Abstract:
Exoplanetary systems with multiple giant planets present an
opportunity to understand planet formation, migration processes, and
long-term system-wide dynamical interactions. We report the discovery
and characterization of a unique multi-planet system hosting three gas
giant planets orbiting the post-main-sequence star TOI-375. The
innermost planet, TOI-375 b, was initially detected by the TESS
mission, and then confirmed with photometric follow-up observations
and radial velocity measurements obtained with FEROS and CHIRON. The
radial velocity data revealed the presence of two additional planetary
candidates, TOI-375 c and TOI-375 d. We find that TOI-375 b is a hot
Jupiter with an orbital period of 9.45469±0.00002 days, a mass of
0.745±0.053MJ, a radius of 0.961±0.043RJ, and an eccentricity
of 0.087±0.042. The outer two planets have orbital periods of 115.5
and 297.9 days, and minimum masses of 2.11±0.22MJ and
1.40±0.28MJ, respectively. The discovery of TOI-375 as the first
known system hosting three or more fully evolved gas giants, with at
least one transiting planet, makes it an excellent candidate for
testing formation and migration theories.
Description:
This dataset contains the radial velocity measurements and photometric
light curve data for TOI-375. Radial velocities were obtained with
FEROS (Fiber-fed Extended Range Optical Spectrograph) on the MPG 2.2m
telescope at La Silla Observatory and CHIRON on the SMARTS 1.5m
telescope at Cerro Tololo Inter-American Observatory between 2018 and
2019. Photometric observations were carried out with TESS across
multiple sectors, MEarth-South, and the LCOGT 1m network.
Objects:
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RA (2000) DE Designation(s)
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03 08 35.99 -77 22 59.9 TOI-375 =TIC 280097543
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
rvs.dat 35 66 Radial velocity measurements
lc.dat 58 32223 Photometric light curve data
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Byte-by-byte Description of file: rvs.dat
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Bytes Format Units Label Explanations
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1- 13 F13.5 d BJD Barycentric Julian Date (TDB)
15- 21 F7.1 m/s RV Radial velocity for FEROS,
relative radial velocity for CHIRON
23- 26 F4.1 m/s e_RV Uncertainty in RV
28- 35 A8 --- Inst Instrument (1)
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Note (1): Instrument used for observation as follows:
FEROS = Fiber-fed Extended Range Optical Spectrograph (MPG 2.2m)
CHIRON-1 = CHIRON echelle spectrograph mode 1 (SMARTS 1.5m)
CHIRON-2 = CHIRON echelle spectrograph mode 2 (SMARTS 1.5m)
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Byte-by-byte Description of file: lc.dat
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Bytes Format Units Label Explanations
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1- 15 F15.7 d BJD Barycentric Julian Date (TDB)
17- 28 F12.10 --- RFlux Normalized flux
33- 46 F14.12 --- e_RFlux Uncertainty in RFlux
49- 58 A10 --- Inst Instrument (1)
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Note (1): Instrument/facility used for observation as follows:
TESS-s1 = TESS Sector 1 (30-minute cadence)
TESS-s2 = TESS Sector 2 (30-minute cadence)
TESS-s13 = TESS Sector 13 (2-minute cadence)
TESS-s27 = TESS Sector 27 (2-minute cadence)
TESS-s28 = TESS Sector 28 (2-minute cadence)
TESS-s39 = TESS Sector 39 (2-minute cadence)
TESS-s66 = TESS Sector 66 (2-minute cadence)
TESS-s67 = TESS Sector 67 (2-minute cadence)
TESS-s68 = TESS Sector 68 (2-minute cadence)
MEARTH-S = MEarth-South telescope
LCOGTSAAOz = LCOGT at South African Astronomical Observatory
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Acknowledgements:
Yared Reinarz, reinarz(at)mpia.de
(End) Patricia Vannier [CDS] 03-Dec-2025