J/A+A/679/A70 TOI-858 A and TOI-858 B RV data (Hagelberg+, 2023)
TOI-858 B b: A hot Jupiter on a polar orbit in a loose binary.
Hagelberg J., Nielsen L.D., Attia O., Bourrier V., Pearce L., Venturini J.,
Winn J.N., Bouchy F., Bouma L.G., Briceno C., Collins K.A., Davis A.B.,
Eastman J.D., Evans P., Grieves N., Guerrero N.M., Hellier C., Jones M.I.,
Latham D.W., Law N., Mann A.W., Marmier M., Ottoni G., Radford D.J.,
Restori N., Rudat A., Dos Santos L., Seager S., Stassun K., Stockdale C.,
Udry S., Wang S., Ziegler C.
<Astron. Astrophys. 679, A70 (2023)>
=2023A&A...679A..70H 2023A&A...679A..70H (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Exoplanets ; Stars, G-type ;
Radial velocities ; Optical
Keywords: planets and satellites: detection -
planets and satellites: individual: TOI-858B -
planets and satellites: individual: TOI-858A -
planets and satellites: dynamical evolution and stability -
binaries: visual
Abstract:
We report the discovery of a hot Jupiter on a 3.28-day orbit around a
1.08M☉ G0 star that is the secondary component in a loose binary
system. Based on follow-up radial velocity observations of TOI-858 B
with CORALIE on the Swiss 1.2m telescope and CHIRON on the 1.5m
telescope at the Cerro Tololo Inter-American Observatory (CTIO), we
measured the planet mass to be 1.10±0.08MJup. Two transits were
further observed with CORALIE to determine the alignment of TOI-858 B
b with respect to its host star. Analysis of the Rossiter-McLaughlin
signal from the planet shows that the sky-projected obliquity is
lambda=99.3±3.8. Numerical simulations show that the neighbour star
TOI-858 A is too distant to have trapped the planet in a Kozai-Lidov
resonance, suggesting a different dynamical evolution or a primordial
origin to explain this misalignment. The 1.15M☉ primary F9 star
of the system (TYC 8501-01597-1, at rho∼11'') was also observed with
CORALIE in order to provide upper limits for the presence of a
planetary companion orbiting that star.
Description:
Radial velocity observations of the two components of the visual
binary composed of the stars TOI-858 B and TOI-858 A.
We obtained 22 spectra between 2019 August13 and 2021 January 18 UT
with simultaneous FP to monitor the RV of TOI-858 B as it was orbited
by TOI-858 B b. The exposure times ranged between 1800 and 1200s,
depending on the observing schedule, resulting in an average S/N per
pixel of 15 at 5500Å.
For TOI-858 A, we acquired nine CORALIE spectra between 2019 October
17 and 2020 March 12 UT in order to check for additional stars and
giant planets in the system. All spectra were taken with simultaneous
FP, and nearly all had exposure times of 1800s, while one was set to
1200s. The average S/N per pixel were 19 at 5500Å.
We obtained spectroscopic data of TOI-858 B using the CHIRON
spectrograph, a high-resolution fibre-fed spectrograph mounted on the
1.5m telescope at the Cerro Tololo Inter-American Observatory (CTIO)
in Chile. We obtained in total seven different spectra between 2019
August 9 and 2019 September 1. For these observations, we used the
image slicer mode (resolving power ∼80000) and an exposure time of
600s, leading to a relatively low S/N per pixel of ∼8-10 at 5500Å
and RV uncertainties of 20-40m/s.
Objects:
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RA (2000) DE Designation(s)
-----------------------------------------------------
04 00 47.93 -54 35 34.3 TOI-858 B = TIC 198008005
04 00 48.16 -54 35 45.0 TOI-858 A = TIC 198008002
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File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
tablea1.dat 85 22 CORALIE radial velocity follow-up observations
of TOI-858 B
tablea2.dat 59 7 CHIRON radial velocity follow-up observations
of TOI-858 B
tablea3.dat 74 9 CORALIE radial velocity follow-up observations
of TOI-858 A
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Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 12 F12.6 d BJD Barycentric Julian date (BJD-2400000)
14- 21 F8.2 m/s RV Radial velocity
24- 29 F6.2 m/s e_RV Radial velocity error
31- 37 F7.5 km/s FWHM FWHM span of the CCF
39- 44 F6.3 --- Cont Contrast span of the CCF
46- 51 F6.2 m/s BIS Bissector span of the CCF
53- 59 F7.5 --- noise ?=0 Photon noise
61- 64 F4.2 --- sn10 ?=0 Signal to noise in order 10
66- 70 F5.2 --- sn50 ?=0 Signal to noise in order 50
72- 76 F5.2 --- sn60 ?=0 Signal to noise in order 60
78- 85 F8.4 m/s e_BIS Bissector span of the CCF error
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Byte-by-byte Description of file: tablea2.dat
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Bytes Format Units Label Explanations
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1- 11 F11.5 d BJD Barycentric Julian date (BJD-2400000)
13- 17 F5.1 m/s RV Relative radial velocity
19- 22 F4.1 m/s e_RV Relative radial velocity error
24- 28 F5.1 m/s BIS Bissector span of the CCF
30- 34 F5.1 m/s e_BIS Bissector span of the CCF error
36- 41 F6.3 km/s FWHM FWHM span of the CCF
43- 47 F5.3 km/s e_FWHM FWHM span of the CCF error
49- 51 I3 s Texp Exposure time
53- 55 I3 ct Flux Flux
57- 59 I3 --- PID [523] PID
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Byte-by-byte Description of file: tablea3.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 12 F12.6 d BJD Barycentric Julian date (BJD-2400000)
14- 21 F8.2 m/s RV Radial velocity
23- 27 F5.2 m/s e_RV Radial velocity error
29- 35 F7.5 km/s FWHM FWHM span of the CCF
37- 42 F6.3 --- Cont Contrast span of the CCF
44- 49 F6.2 m/s BIS Bissector span of the CCF
51- 57 F7.5 --- noise Photon noise
59- 62 F4.2 --- sn10 Signal to noise in order 10
64- 68 F5.2 --- sn50 Signal to noise in order 50
70- 74 F5.2 --- sn60 Signal to noise in order 60
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Acknowledgements:
Janis Hagelberg, janis.hagelberg(at)unige.ch
(End) Patricia Vannier [CDS] 22-Sep-2023