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Spectral and orbital characterisation of the directly imaged giant planet HIP 65426 b

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Cheetham, A. C., Samland, M., Brems, S. S., Launhardt, R., Chauvin, G., Ségransan, D., Henning, T., Quirrenbach, A., Avenhaus, H., Cugno, G. et al.
(2019) Spectral and orbital characterisation of the directly imaged giant planet HIP 65426 b. Astronomy & Astrophysics, 622 . A80. doi:10.1051/0004-6361/201834112

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Official URL: http://dx.doi.org/10.1051/0004-6361/201834112

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Abstract

HIP 65426 b is a recently discovered exoplanet imaged during the course of the SPHERE-SHINE survey. Here we present new L′ and M′ observations of the planet from the NACO instrument at the VLT from the NACO-ISPY survey, as well as a new Y –H spectrum and K-band photometry from SPHERE-SHINE. Using these data, we confirm the nature of the companion as a warm, dusty planet with a mid-L spectral type. From comparison of its SED with the BT-Settl atmospheric models, we derive a best-fit effective temperature of Teff = 1618 ± 7 K, surface gravity log g = 3.78−0.03+0.04 and radius R = 1.17 ± 0.04RJ (statistical uncertainties only). Using the DUSTY and COND isochrones we estimate a mass of 8 ± 1MJ. Combining the astrometric measurements from our new datasets and from the literature, we show the first indications of orbital motion of the companion (2.6σ significance)and derive preliminary orbital constraints. We find a highly inclined orbit (i = 1.07−10+13 deg) with an orbital period of 800−400+1200 yr. We also report SPHERE sparse aperture masking observations that investigate the possibility that HIP 65426 b was scattered onto its current orbit by an additional companion at a smaller orbital separation. From this data we rule out the presence of brown dwarf companions with masses greater than 16 MJ at separations larger than 3 AU, significantly narrowing the parameter space for such a companion.

Item Type: Journal Article
Subjects: Q Science > QB Astronomy
Divisions: Faculty of Science > Physics
Library of Congress Subject Headings (LCSH): Extrasolar planets, Planetary systems
Journal or Publication Title: Astronomy & Astrophysics
Publisher: EDP Sciences
ISSN: 0004-6361
Official Date: February 2019
Dates:
DateEvent
February 2019Published
31 January 2019Available
18 December 2018Accepted
Date of first compliant deposit: 15 February 2019
Volume: 622
Article Number: A80
DOI: 10.1051/0004-6361/201834112
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
PlanetS[SNSF] Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschunghttp://dx.doi.org/10.13039/501100001711
MU4172/1-1[DFG] Deutsche Forschungsgemeinschafthttp://dx.doi.org/10.13039/501100001659
UNSPECIFIEDUniversidad de Valparaísohttp://dx.doi.org/10.13039/501100004427
180395[FONDECYT] Fondo Nacional de Desarrollo Científico y Tecnológicohttp://dx.doi.org/10.13039/501100002850
Convocatorianacional subvención a la instalación en la academiaConsejo Nacional de Innovación, Ciencia y Tecnologíahttp://dx.doi.org/10.13039/501100009068
Convocatoria 2017+ Folio PAI77170087Consejo Nacional de Innovación, Ciencia y Tecnologíahttp://dx.doi.org/10.13039/501100009068
Doctorado Nacional/2017 folio 21170650Consejo Nacional de Innovación, Ciencia y TecnologíaUNSPECIFIED
RII3-Ct-2004-00156Sixth Framework Programmehttp://dx.doi.org/10.13039/100011103
226604Seventh Framework Programmehttp://dx.doi.org/10.13039/100011102
312430Seventh Framework Programmehttp://dx.doi.org/10.13039/100011102
ANR10 LABX56[ANR] Agence Nationale de la Recherchehttp://dx.doi.org/10.13039/501100001665
UNSPECIFIED[NASA] National Aeronautics and Space Administrationhttp://dx.doi.org/10.13039/100000104
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