Discovery of a stellar companion to HD 131399A

Lagrange, A. M.; Keppler, M.; Beust, H.; Rodet, L.; Meunier, N.; Lillo-Box, J.; Bonnefoy, M.; Galland, F.

doi:10.1051/0004-6361/201730978

Cited by 5 publications

(5 citation statements)

References 29 publications

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“…We observed 89 young A-to M-type stars over 3 years or more with HARPS to search for GP and BD with periods less than 1000 days. This survey allowed to detect close binaries around HD106906 and around HD131399 (Lagrange et al 2016(Lagrange et al , 2017. We constrained the period of HD181321B and confirmed the RV trend in HD186704's RV.…”

Section: Discussionmentioning

confidence: 58%

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A HARPS RV search for planets around young nearby stars

Grandjean

Lagrange

Keppler

et al. 2020

A&A

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Context. Young nearby stars are good candidates in the search for planets with both radial velocity (RV) and direct imaging techniques. This, in turn, allows for the computation of the giant planet occurrence rates at all separations. The RV search around young stars is a challenge as they are generally faster rotators than older stars of similar spectral types and they exhibit signatures of magnetic activity (spots) or pulsation in their RV time series. Specific analyses are necessary to characterize, and possibly correct for, this activity. Aims. Our aim is to search for planets around young nearby stars and to estimate the giant planet (GP) occurrence rates for periods up to 1000 days. Methods. We used the HARPS spectrograph on the 3.6 m telescope at La Silla Observatory to observe 89 A − M young (< 600 Myr) stars. We used our SAFIR (Spectroscopic data via Analysis of the Fourier Interspectrum Radial velocities ) software to compute the RV and other spectroscopic observables. Then, we computed the companion occurrence rates on this sample. Results. We confirm the binary nature of HD177171, HD181321 and HD186704. We report the detection of a close low mass stellar companion for HIP36985. No planetary companion was detected. We obtain upper limits on the GP (< 13 MJup) and BD (∈ [13; 80] MJup) occurrence rates based on 83 young stars for periods less than 1000 days, which are set, 2 +3 −2 % and 1 +3 −1 %.

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Section: Discussionmentioning

confidence: 58%

“…A GP companion was discovered with SPHERE around HD131399A by Wagner et al (2016) but is now identified as a background star with similar proper motion (Nielsen et al 2017a). We detected in this survey the presence of a close stellar companion to HD131399A, with a period of 10 days (0.1 au), and an M sin i of 450 M Jup (Lagrange et al 2017).…”

Section: Hd131399mentioning

confidence: 68%

A HARPS RV search for planets around young nearby stars

Grandjean

Lagrange

Keppler

et al. 2020

A&A

Self Cite

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“…In Wagner et al (2016), we reported the detection of a planetary-mass companion on an ∼80 au orbit within the HD 131399 quadruple system (at the time thought to be a triple: Lagrange et al 2017). Subsequent observations determined that this object is likely to be a high-velocity background star with its own significant proper motion aligned with the system (Nielsen et al 2017).…”

Section: Hd 131399abmentioning

confidence: 93%

The Scorpion Planet Survey: Wide-Orbit Giant Planets Around Young A-type Stars

Wagner,

Apai,

Kasper

et al. 2021

Preprint

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The first directly imaged exoplanets indicated that wide-orbit giant planets could be more common around A-type stars. However, the relatively small number of nearby A-stars has limited the precision of exoplanet demographics studies to 10%. We aim to constrain the frequency of wideorbit giant planets around A-stars using the VLT/SPHERE extreme adaptive optics system, which enables targeting 100 A-stars between 100−200 pc. We present the results of a survey of 84 A-stars within the nearby ∼5−17 Myr-old Sco OB2 association. The survey detected three companions−one of which is a new discovery (HIP75056Ab), whereas the other two (HD 95086b and HIP65426b) are now-known planets that were included without a priori knowledge of their existence. We assessed the image sensitivity and observational biases with injection and recovery tests combined with Monte Carlo simulations to place constraints on the underlying demographics. We measure a decreasing frequency of giant planets with increasing separation, with measured values falling between 10−2% for separations of 30−100 au, and 95% confidence-level (CL) upper limits of 45−8% for planets on 30−100 au orbits, and 5% between 200−500 au. These values are in excellent agreement with recent surveys of A-stars in the solar neighborhood−supporting findings that giant planets at 100 au are more frequent around A-stars than around solar-type hosts. Finally, the relatively low occurrence rate of super-Jupiters on wide orbits, the positive correlation with stellar mass, and the inverse correlation with orbital separation are consistent with core accretion being their dominant formation mechanism.

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“…In addition to HD 106906 and HD 131399, which were already known to be spectroscopic binaries (Lagrange et al 2016(Lagrange et al , 2017, 13 stars present evidence of a companion in their RV time series. When enough data were available, we constrained the orbital elements and the m c sin i of the companions (SB1, BD, GP) using yorbit (Ségransan et al 2011).…”

Section: Detected Companions In the Harps Sco-cen Surveymentioning

confidence: 94%

HARPS radial velocity search for planets in the Scorpius-Centaurus association

Grandjean¹,

Lagrange²,

Meunier³

et al. 2022

A&A

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Context. The Scorpius-Centaurus (Sco-Cen) young and nearby massive star-forming region is particularly well suited for extrasolar planet searches with both direct imaging and radial velocity (RV) techniques. The RV search, however, is challenging, as the stars are faster rotators on average than their older stellar counterparts of similar spectral types. Moreover, the RV time series show strong signatures of stellar variability (spots and faculae) and/or stellar pulsations. Aims. Our aim is to search for giant planets (GPs) and brown dwarfs at short orbital distances around star members of the Sco-Cen association. We also aim at using these data together with others available on young stars to estimate the GP occurrence rate for young stars for periods of up to 1000 days. Methods. We used the High Accuracy Radial velocity Planet Searcher (HARPS) spectrograph on the 3.6 m telescope at the La Silla Observatory to monitor 88 A − F Sco-Cen stars. To improve our statistics and analysis, we combined this survey with two previous surveys that focused on young nearby stars (YNS) to compute companion occurrence rates from a sample of 176 young A − M stars. Results. We report the discovery of a massive hot-Jupiter candidate around HD 145467, together with the discovery of one probable short-period (P < 10 days) brown dwarf around HD 149790. In addition, we confirm the binary nature of eight single-line binaries:

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Discovery of a stellar companion to HD 131399A

Cited by 5 publications

References 29 publications

A HARPS RV search for planets around young nearby stars

A HARPS RV search for planets around young nearby stars

The Scorpion Planet Survey: Wide-Orbit Giant Planets Around Young A-type Stars

HARPS radial velocity search for planets in the Scorpius-Centaurus association

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