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  • 1. Cheetham, A. C.
    et al.
    Samland, M.
    Brems, S. S.
    Launhardt, R.
    Chauvin, G.
    Ségransan, D.
    Henning, T.
    Quirrenbach, A.
    Avenhaus, H.
    Cugno, G.
    Girard, J.
    Godoy, N.
    Kennedy, G. M.
    Maire, A-L
    Metchev, S.
    Müller, A.
    Barcucci, A. Musso
    Olofsson, J.
    Pepe, F.
    Quanz, S. P.
    Queloz, D.
    Reffert, S.
    Rickman, E.
    Van Boekel, R.
    Boccaletti, A.
    Bonnefoy, M.
    Cantalloube, F.
    Charnay, B.
    Delorme, P.
    Janson, Markus
    Stockholm University, Faculty of Science, Department of Astronomy. Max Planck Institute for Astronomy, Germany.
    Keppler, M.
    Lagrange, A-M
    Langlois, M.
    Lazzoni, C.
    Menard, F.
    Mesa, D.
    Meyer, M.
    Schmidt, T.
    Sissa, E.
    Udry, S.
    Zurlo, A.
    Spectral and orbital characterisation of the directly imaged giant planet HIP 65426 b2019In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 622, article id A80Article in journal (Refereed)
    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-eff = 1618 +/- 7 K, surface gravity log g = 3 : 78(-0.03)(+0.04) and radius R = 1.17 +/- 0.04 R-J (statistical uncertainties only). Using the DUSTY and COND isochrones we estimate a mass of 8 +/- 1 MJ. Combining the astrometric measurements from our new datasets and from the literature, we show the first indications of orbital motion of the companion (2.6 sigma significance) and derive preliminary orbital constraints. We find a highly inclined orbit (i = 107(+13)(-10) deg) with an orbital period of 800(+1200)(-400) 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-J at separations larger than 3AU, significantly narrowing the parameter space for such a companion.

  • 2. Osborn, H. P.
    et al.
    Kenworthy, M.
    Rodriguez, J. E.
    de Mooij, E. J. W.
    Kennedy, G. M.
    Relles, H.
    Gomez, E.
    Hippke, M.
    Banfi, M.
    Barbieri, L.
    Becker, I. S.
    Benni, P.
    Berlind, P.
    Bieryla, A.
    Bonnoli, G.
    Boussier, H.
    Brincat, S. M.
    Briol, J.
    Burleigh, M. R.
    Butterley, T.
    Calkins, M. L.
    Chote, P.
    Ciceri, Simona
    Stockholm University, Faculty of Science, Department of Astronomy.
    Deldem, M.
    Dhillon, V. S.
    Dose, E.
    Dubois, F.
    Dvorak, S.
    Esquerdo, G. A.
    Evans, D. F.
    Ferratfiat, S.
    Fossey, S. J.
    Günther, M. N.
    Hall, J.
    Hambsch, F.-J.
    Herrero, E.
    Hills, K.
    James, R.
    Jayawardhana, R.
    Kafka, S.
    Killestein, T. L.
    Kotnik, C.
    Latham, D. W.
    Lemay, D.
    Lewin, P.
    Littlefair, S.
    Lopresti, C.
    Mallonn, M.
    Mancini, L.
    Marchini, A.
    McCormac, J. J.
    Murawski, G.
    Myers, G.
    Papini, R.
    Popov, V.
    Quadri, U.
    Quinn, S. N.
    Raynard, L.
    Rizzuti, L.
    Robertson, J.
    Salvaggio, F.
    Scholz, A.
    Sfair, R.
    Smith, A. M. S.
    Southworth, J.
    Tan, T. G.
    Vanaverbeke, S.
    Waagen, E. O.
    Watson, C. A.
    West, R. G.
    Winter, O. C.
    Wheatley, P. J.
    Wilson, R. W.
    Zhou, G.
    The PDS 110 observing campaign - photometric and spectroscopic observations reveal eclipses are aperiodic2019In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 485, no 2, p. 1614-1625Article in journal (Refereed)
    Abstract [en]

    PDS 110 is a young disc-hosting star in the Orion OB1A association. Two dimming events of similar depth and duration were seen in 2008 (WASP) and 2011 (KELT), consistent with an object in a closed periodic orbit. In this paper, we present data from a ground-based observing campaign designed to measure the star both photometrically and spectroscopically during the time of predicted eclipse in 2017 September. Despite high-quality photometry, the predicted eclipse did not occur, although coherent structure is present suggesting variable amounts of stellar flux or dust obscuration. We also searched for radial velocity (RV) oscillations caused by any hypothetical companion and can rule out close binaries to 0.1Ms. Asearch of Sonneberg plate archive data also enabled us to extend the photometric baseline of this star back more than 50 yr, and similarly does not re-detect any deep eclipses. Taken together, they suggest that the eclipses seen in WASP and KELT photometry were due to aperiodic events. It would seem that PDS 110 undergoes stochastic dimmings that are shallower and of shorter duration than those of UX Ori variables, but may have a similar mechanism.

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