J/A+A/638/A5 HD 285507 and AD Leo light and velocity curves (Carleo+, 2020)
The GAPS Programme at TNG.
XXI. A GIARPS case-study of known young planetary candidates:
confirmation of HD 285507 b and refutation of AD Leo b.
Carleo I., Malavolta L., Lanza A.F., Damasso M., Desidera S., Borsa F.,
Mallonn M., Pinamonti M., Gratton R., Alei E., Benatti S., Mancini L.,
Maldonado J., Biazzo K., Esposito M., Frustagli G., Gonzalez-Alvarez E.,
Micela G., Scandariato G., Sozzetti A., Affer L., Bignamini A., Bonomo A.S.,
Claudi R., Cosentino R., Covino E., Fiorenzano A.F.M., Giacobbe P.,
Harutyunyan A., Leto G., Maggio A., Molinari E., Nascimbeni V., Pagano I.,
Pedani M., Piotto G., Poretti E., Rainer M., Redfield S., Baffa C.,
Baruffolo A., Buchschacher N., Billotti V., Cecconi M., Falcini G.,
Fantinel D., Fini L., Galli A., Ghedina A., Ghinassi F., Giani E.,
Gonzalez C., Gonzalez M., Guerra J., Hernandez Diaz M., Hernandez N.,
Iuzzolino M., Lodi M., Oliva E., Origlia L., Perez Ventura H., Puglisi A.,
Riverol C., Riverol L., San Juan J., Sanna N., Scuderi S., Seemann U.,
Sozzi M., Tozzi A.
<Astron. Astrophys. 638, A5 (2020)>
=2020A&A...638A...5C 2020A&A...638A...5C (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Exoplanets ; Spectroscopy ;
Radial velocities
Keywords: instrumentation: spectrographs - planetary systems -
technique: spectroscopic - stars: activity -
techniques: radial velocities
Abstract:
The existence of hot Jupiters is still not well understood. Two main
channels are thought to be responsible for their current location: a
smooth planet migration through the proto-planetary disk or the
circularization of an initial high eccentric orbit by tidal
dissipation leading to a strong decrease of the semimajor axis.
Different formation scenarios result in different observable effects,
such as orbital parameters (obliquity/eccentricity), or frequency of
planets at different stellar ages.
In the context of the GAPS Young-Objects project, we are carrying out
a radial velocity survey with the aim to search and characterize young
hot-Jupiter planets. Our purpose is to put constraints on evolutionary
models and establish statistical properties, such as the frequency of
these planets from a homogeneous sample.
Since young stars are in general magnetically very active, we
performed multi-band (visible and near-infrared) spectroscopy with
simultaneous GIANO-B + HARPS-N (GIARPS) observing mode at TNG. This
helps to deal with stellar activity and distinguish the nature of
radial velocity variations: stellar activity will introduce a
wavelength-dependent radial velocity amplitude, whereas a Keplerian
signal is achromatic. As a pilot study, we present here the cases of
two already claimed hot Jupiters orbiting young stars: HD 285507 b and
AD Leo b.
Our analysis of simultaneous high-precision GIARPS spectroscopic data
confirms the Keplerian nature of HD285507's radial velocities
variation and refines the orbital parameters of the hot Jupiter,
obtaining an eccentricity consistent with a circular orbit. On the
other hand, our analysis does not confirm the signal previously
attributed to a planet orbiting AD∼Leo. This demonstrates the power of
the multi-band spectroscopic technique when observing active stars.
Description:
Time series of HD285507 and ADLeo from GIANO-B, HARPS-N, STELLA in V
and I - bands.
Objects:
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RA (2000) DE Designation(s)
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04 07 01.23 +15 20 06.1 HD285507 = BD+14 653
10 19 36.28 +19 52 12.0 AD Leo = BD+20 2465
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
hd2855-h.dat 38 18 HARPS-N radial velocities of HD 285507
hd2855-g.dat 38 30 GIANO-B radial velocities of HD 285507
adleo-h1.dat 38 42 HARPS-N radial velocities of AD Leo (dataset 1)
adleo-h2.dat 38 21 HARPS-N radial velocities of AD Leo (dataset 2)
adleo-g1.dat 38 12 GIANO-B radial velocities of AD Leo (dataset 1)
adleo-g2.dat 38 13 GIANO-B radial velocities of AD Leo (dataset 2)
adleo-sv.dat 27 116 STELLA V-band photometric flux of AD Leo
adleo-si.dat 27 116 STELLA I-band photometric flux of AD Leo
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Byte-by-byte Description of file: hd2855*.dat dat adleo-h?.dat adleo-g?.dat
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Bytes Format Units Label Explanations
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1- 10 F10.5 d JD Julian date (JD-2450000)
12- 17 F6.3 km/s RV Radial velocities
19- 23 F5.3 km/s e_RV Radial velocities error
25- 32 F8.5 km/s BIS Bisector
34- 38 F5.3 km/s e_BIS Bisector error
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Byte-by-byte Description of file: adleo-si.dat adleo-sv.dat
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Bytes Format Units Label Explanations
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1- 11 F11.6 d JD Julian date (JD-2450000)
13- 19 F7.4 -- Flux Normalized photometric flux V-band
21- 27 F7.4 -- e_Flux Flux error
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Acknowledgements:
Ilaria Carleo, icarleo(at)wesleyan.edu
(End) Patricia Vannier [CDS] 26-Feb-2020