stars: individual: HIP 65426; planets and satellites: atmospheres; techniques: high angular resolution; planets and satellites: detection; planetary systems; Astrophysics - Earth and Planetary Astrophysics; Astrophysics - Solar and Stellar Astrophysics
Abstract :
[en] 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 T[SUB]eff[/SUB] = 1618 ± 7 K, surface gravity log g = 3.78[SUB]-0.03[/SUB][SUP]+0.04[/SUP] and radius R = 1.17 ± 0.04R[SUB]J[/SUB] (statistical uncertainties only). Using the DUSTY and COND isochrones we estimate a mass of 8 ± 1M[SUB]J[/SUB]. 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[SUB]-10[/SUB][SUP]+13[/SUP] deg) with an orbital period of 800[SUB]-400[/SUB][SUP]+1200[/SUP] 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 M[SUB]J[/SUB] at separations larger than 3 AU, significantly narrowing the parameter space for such a companion. <P />Based on observations collected at the European Organisation for Astronomical Research in the Southern Hemisphere under ESO programmes 199.C-0065 (PI: Launhardt), 198.C-0209 (PI: Beuzit) and 1100.C-0481 (PI: Beuzit).
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Cheetham, A. C.; Département d'Astronomie, Université de Genève, 51 chemin des Maillettes, 1290, Versoix, Switzerland
Samland, M.; Max Planck Institute for Astronomy, Königstuhl 17, 69117, Heidelberg, Germany
Brems, S. S.; Landessternwarte, Zentrum für Astronomie der Universität Heidelberg, Königstuhl 12, 69117, Heidelberg, Germany
Launhardt, R.; Max Planck Institute for Astronomy, Königstuhl 17, 69117, Heidelberg, Germany
Chauvin, G.; Université Grenoble Alpes, CNRS, IPAG, 38000, Grenoble, France ; Unidad Mixta Internacional Franco-Chilena de Astronomía, CNRS/INSU UMI 3386 and Departamento de Astronomía, Universidad de Chile, Casilla 36-D, Santiago, Chile
Ségransan, D.; Département d'Astronomie, Université de Genève, 51 chemin des Maillettes, 1290, Versoix, Switzerland
Henning, T.; Max Planck Institute for Astronomy, Königstuhl 17, 69117, Heidelberg, Germany
Quirrenbach, A.; Landessternwarte, Zentrum für Astronomie der Universität Heidelberg, Königstuhl 12, 69117, Heidelberg, Germany
Avenhaus, H.; Max Planck Institute for Astronomy, Königstuhl 17, 69117, Heidelberg, Germany
Cugno, G.; Institute for Particle Physics and Astrophysics, ETH Zurich, Wolfgang-Pauli-Strasse 27, 8093, Zurich, Switzerland
Girard, J.; Space Telescope Science Institute, 3700 San Martin Dr. Baltimore, MD, 21218, USA
Godoy, N.; Instituto de Física y Astronomía, Facultad de Ciencias, Universidad de Valparaíso, Av. Gran Bretaña 1111, Playa Ancha, Valparaíso, Chile ; Núcleo Milenio Formación Planetaria - NPF, Universidad de Valparaíso, Av. Gran Bretaña 1111, Valparaíso, Chile
Kennedy, G. M.; Department of Physics, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, UK
Maire, Anne-Lise ; Max Planck Institute for Astronomy, Königstuhl 17, 69117, Heidelberg, Germany
Metchev, S.; Landessternwarte, Zentrum für Astronomie der Universität Heidelberg, Königstuhl 12, 69117, Heidelberg, Germany ; Department of Physics and Astronomy, Centre for Planetary Science and Exploration, The University of Western Ontario, London, ON N6A 3K7, Canada ; Department of Physics and Astronomy, Stony Brook University, Stony Brook, NY, 11794-3800, USA
Müller, A.; Max Planck Institute for Astronomy, Königstuhl 17, 69117, Heidelberg, Germany
Musso Barcucci, A.; Max Planck Institute for Astronomy, Königstuhl 17, 69117, Heidelberg, Germany
Olofsson, J.; Instituto de Física y Astronomía, Facultad de Ciencias, Universidad de Valparaíso, Av. Gran Bretaña 1111, Playa Ancha, Valparaíso, Chile ; Núcleo Milenio Formación Planetaria - NPF, Universidad de Valparaíso, Av. Gran Bretaña 1111, Valparaíso, Chile
Pepe, F.; Département d'Astronomie, Université de Genève, 51 chemin des Maillettes, 1290, Versoix, Switzerland
Quanz, S. P.; Institute for Particle Physics and Astrophysics, ETH Zurich, Wolfgang-Pauli-Strasse 27, 8093, Zurich, Switzerland
Reffert, S.; Landessternwarte, Zentrum für Astronomie der Universität Heidelberg, Königstuhl 12, 69117, Heidelberg, Germany
Rickman, E.; Département d'Astronomie, Université de Genève, 51 chemin des Maillettes, 1290, Versoix, Switzerland
van Boekel, R.; Max Planck Institute for Astronomy, Königstuhl 17, 69117, Heidelberg, Germany
Boccaletti, A.; LESIA, Observatoire de Paris, PSL Research University, CNRS, Sorbonne Universités, UPMC Université Paris 06, Université Paris Diderot, Sorbonne Paris Cité, 5 place Jules Janssen, 92195, Meudon, France
Bonnefoy, M.; Université Grenoble Alpes, CNRS, IPAG, 38000, Grenoble, France
Cantalloube, F.; Max Planck Institute for Astronomy, Königstuhl 17, 69117, Heidelberg, Germany
Charnay, B.; LESIA, Observatoire de Paris, PSL Research University, CNRS, Sorbonne Universités, UPMC Université Paris 06, Université Paris Diderot, Sorbonne Paris Cité, 5 place Jules Janssen, 92195, Meudon, France
Delorme, P.; Université Grenoble Alpes, CNRS, IPAG, 38000, Grenoble, France
Janson, M.; Max Planck Institute for Astronomy, Königstuhl 17, 69117, Heidelberg, Germany ; Department of Astronomy, Stockholm University, AlbaNova University Center, 10691, Stockholm, Sweden
Keppler, M.; Max Planck Institute for Astronomy, Königstuhl 17, 69117, Heidelberg, Germany
Lagrange, A.-M.; Université Grenoble Alpes, CNRS, IPAG, 38000, Grenoble, France
Langlois, M.; Aix-Marseille Université, CNRS, LAM (Laboratoire d'Astrophysique de Marseille) UMR 7326, 13388, Marseille, France ; CRAL, UMR 5574, CNRS, Université de Lyon, Ecole Normale Supérieure de Lyon, 46 Allée d'Italie, 69364, Lyon Cedex 07, France
Menard, F.; Université Grenoble Alpes, CNRS, IPAG, 38000, Grenoble, France
Mesa, D.; INAF - Osservatorio Astronomico di Padova, Vicolo dell' Osservatorio 5, 35122, Padova, Italy ; INCT, Universidad De Atacama, calle Copayapu 485, Copiapó, Atacama, Chile
Meyer, M.; Department of Astronomy, University of Michigan, 1085 S. University Ave, Ann Arbor, MI, 48109-1107, USA
Schmidt, T.; LESIA, Observatoire de Paris, PSL Research University, CNRS, Sorbonne Universités, UPMC Université Paris 06, Université Paris Diderot, Sorbonne Paris Cité, 5 place Jules Janssen, 92195, Meudon, France
Udry, S.; Département d'Astronomie, Université de Genève, 51 chemin des Maillettes, 1290, Versoix, Switzerland
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