J/A+A/692/A263 BEAST giant planets population around B stars (Delorme+, 2024)
Population of giant planets around B stars from the first part of the
BEAST survey.
Delorme P., Chomez A., Squicciarini V., Janson M., Flasseur O., Schib O.,
Gratton R., Lagrange A.-M., Langlois M., Mayer L., Helled R., Reffert S.,
Kiefer F., Biller B., Chauvin G., Fontanive C., Henning T., Kenworthy M.,
Marleau G.-D., Mesa D., Meyer M.R., Mordasini C., Ringqvist S.C.,
Samland M., Vigan A., Viswanath G.
<Astron. Astrophys. 692, A263 (2024)>
=2024A&A...692A.263D 2024A&A...692A.263D (SIMBAD/NED BibCode)
ADC_Keywords: Stars, B-type ; Exoplanets ; Optical
Keywords: methods: statistical - planets and satellites: detection -
planets and satellites: formation - stars: massive -
planets and satellites: gaseous planets
Abstract:
Exoplanets form from circumstellar protoplanetary discs whose
fundamental properties (notably their extent, composition, mass,
temperature and lifetime) depend on the host star properties, such as
their mass and luminosity. B-stars are among the most massive stars
and their protoplanetary discs test extreme conditions for exoplanet
formation. This paper investigates the frequency of giant planet
companions around young B-stars (median age of 16Myr) in the
Scorpius-Centaurus association, the closest association containing a
large population of B-stars. We systematically search for massive
exoplanets with the high-contrast direct imaging instrument SPHERE
using the data from the BEAST survey, that targets an homogeneous
sample of young B-stars from the wide Sco-Cen association. We derive
accurate detection limits in case of non-detections. We found
evidence in previous papers for two substellar companions around 42
stars. The masses of these companions are straddling the ∼13 Jupiter
mass deuterium burning limit but their mass ratio with respect to
their host star is close to that of Jupiter. We derive a frequency of
such massive planetary mass companions around B stars of 11-5+7%,
accounting for the survey sensitivity.
Description:
We process, in a uniform manner, half of the BEAST surveys dataset
obtained via SPHERE/VLT/ESO.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
sources.dat 35 40 List of studied sources
candcomp.dat 117 881 Detection table
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See also:
J/A+A/646/A164 : BEAST sample properties (Janson+, 2021)
Byte-by-byte Description of file: sources.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Object Star name
13- 14 I2 h RAh Simbad right ascension (J2000)
16- 17 I2 min RAm Simbad right ascension (J2000)
19- 23 F5.2 s RAs Simbad right ascension (J2000)
25 A1 --- DE- Simbad declination sign (J2000)
26- 27 I2 deg DEd Simbad declination (J2000)
29- 30 I2 arcmin DEm Simbad declination (J2000)
32- 35 F4.1 arcsec DEs Simbad declination (J2000)
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Byte-by-byte Description of file: candcomp.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Object Star name
11- 32 A22 "datime" Obs.date Observing night
34- 38 F5.1 --- S/N Signal to noise ratio
40- 46 F7.2 mas Sep Separation
48- 56 F9.2 mas e_Sep Error on separation
58- 63 F6.2 deg PA Position angle
65- 72 F8.4 deg e_PA Error on position angle
74- 81 E8.3 --- Contl1 Contrast relative to the star
in the first band
83- 90 E8.3 --- e_Contl1 Error on contrast relative to the star
in the first band
92- 99 E8.3 --- Contl2 Contrast relative to the star
in the second band
101-108 E8.3 --- e_Contl2 Error on contrast relative to the star
in the second band
110-117 A8 --- Status Final status of the detection
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Acknowledgements:
Philippe Delorme, philippe.delorme(at)univ-grenoble-alpes.fr
References:
Janson et al. 2021A&A...646A.164J 2021A&A...646A.164J, J/A+A/646/A164,
Initial presentation of the BEAST survey
Squicciarini et al., 2022A&A...664A...9S 2022A&A...664A...9S, mu.02 Scorpii B discovery paper
Janson et al., 2021Natur.600..231J 2021Natur.600..231J, b Cen b discovery paper
(End) Patricia Vannier [CDS] 16-Oct-2024