J/A+A/693/A81 A giant planet around accelerating HD 57625 (Barbato+, 2025)
A multi-technique detection of an eccentric giant planet around accelerating
star HD 57625.
Barbato D., Mesa D., D'Orazi V., Desidera S., Ruggieri A., Farinato J.,
Marafatto L., Carolo E., Vassallo D., Ertel S., Hom J., Anche R.M.,
Battaini F., Becker A., Bergomi M., Biondi F., Cardwell A., Cerpelloni P.,
Chauvin G., Chinellato S., Desgrange C., Di Filippo S., Dima M.,
Gomes Machado T.S., Gratton R., Greggio D., Henning T., Kenworthy M.,
Laudisio F., Lazzoni C., Leisenring J., Lessio L., Lorenzetto A., Mohr L.,
Montoya M., Rodeghiero G., Patience J., Power J., Ricci D.,
Santhakumari K.K.R., Sozzetti A., Umbriaco G., Vega Pallauta M., Viotto V.,
Wagner K.
<Astron. Astrophys. 693, A81 (2025)>
=2025A&A...693A..81B 2025A&A...693A..81B (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Exoplanets ; Radial velocities ;
Optical
Keywords: techniques: image processing - techniques: radial velocities -
astrometry - planets and satellites: detection - planetary systems
Abstract:
The synergy between different detection methods is a key asset in
exoplanetology, allowing for both precise characterization of detected
exoplanets and robust constraints even in the case of non-detection.
Recently, the interplay between imaging, radial velocities and
astrometry has produced significant advancements in exoplanetary
science. We report a first result of an ongoing survey performed with
SHARK-NIR, the new high-contrast near-infrared imaging camera at the
Large Binocular Telescope, in parallel with LBTI/LMIRCam in order to
detect planetary companions around stars with significant proper
motion anomaly. In this work we focus on HD 57625, a F8 star for which
we determine a 4.8+3.7-2.9Ga age, exhibiting significant
astrometric acceleration and for which archival radial velocities hint
at the presence of a previously undetected massive long-period
companion.
We analyse the imaging data we collected with SHARK-NIR and LMIRCam in
synergy with the available public SOPHIE radial velocity time series
and Hipparcos-Gaia proper motion anomaly. With this joint
multi-technique analysis, we aim at characterizing the companion
responsible for the astrometric and radial velocity signals.
The imaging observations result in a non-detection, indicating the
companion to be in the substellar regime. This is confirmed by the
synergic analysis of archival radial velocity and astrometric
measurements resulting in the detection of HD 57625 b, a
8.43-0.91+1.1Mjup planetary companion with an orbital separation
of 5.70-0.13+0.14au and 0.52-0.03+0.04 eccentricity.
HD 57625 b joins the small but growing population of giant planets in
outer orbits with true mass determination provided by the synergic
usage of multiple detection methods, proving once again the importance
of multi-technique analysis in providing robust characterization of
planetary companions.
Description:
Radial velocity for HD 57625 as retrieved from the SOPHIE archive and
activity indexes extracted from the SOPHIE spectra
Objects:
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RA (2000) DE Designation(s)
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07 25 18.03 +56 34 08.9 HD 57625 = BD+56 1207
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 81 70 RV and activity indices timeseries
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 10 F10.2 d BJD Epochs of measurement
12- 17 F6.4 km/s RV Radial Velocity value
19- 24 F6.4 km/s e_RV Radial Velocity uncertainty
26- 31 F6.4 km/s FWHM Full width half maximum
33- 39 F7.4 km/s BIS Bisector inverse span
41- 46 F6.4 --- Smw S-index
48- 53 F6.4 --- e_Smw S-index uncertainty
55- 60 F6.4 --- Halpha Halpha index
62- 67 F6.4 --- e_Halpha Halpha index uncertainty
69- 74 F6.4 --- NaI NaI index
76- 81 F6.4 --- e_NaI NaI index uncertainty
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Acknowledgements:
Domenico Barbato, domenico.barbato(at)inaf.it
(End) Patricia Vannier [CDS] 10-Dec-2024