Browsing by Author "Henning, Th"

Now showing 1 - 3 of 3
  • Thumbnail Image
    Item
    An optical transmission spectrum of the transiting hot Jupiter in the metal-poor WASP-98 planetary system
    (2016) Mancini, L.; Giordano, M.; Molliere, P.; Southworth, J.; Brahm Scott, Rafael; Ciceri, S.; Henning, Th
  • No Thumbnail Available
    Item
    Ongoing flyby in the young multiple system UX Tauri
    (2020) Menard, F.; Cuello, N.; Ginski, C.; van der Plas, G.; Villenave, M.; Gonzalez, J-F; Pinte, C.; Benisty, M.; Boccaletti, A.; Price, D. J.; Boehler, Y.; Chripko, S.; de Boer, J.; Dominik, C.; Garufi, A.; Gratton, R.; Hagelberg, J.; Henning, Th; Langlois, M.; Maire, A. L.; Pinilla, P.; Ruane, G. J.; Schmid, H. M.; van Holstein, R. G.; Vigan, A.; Zurlo, A.; Hubin, N.; Pavlov, A.; Rochat, S.; Sauvage, J-F; Stadler, E.
    We present observations of the young multiple system UX Tauri to look for circumstellar disks and for signs of dynamical interactions. We obtained SPHERE/IRDIS deep differential polarization images in the J and H bands. We also used ALMA archival CO data. Large extended spirals are well detected in scattered light coming out of the disk of UX Tau A. The southern spiral forms a bridge between UX Tau A and C. These spirals, including the bridge connecting the two stars, all have a CO (3-2) counterpart seen by ALMA. The disk of UX Tau C is detected in scattered light. It is much smaller than the disk of UX Tau A and has a major axis along a different position angle, suggesting a misalignment. We performed PHANTOM SPH hydrodynamical models to interpret the data. The scattered light spirals, CO emission spirals and velocity patterns of the rotating disks, and the compactness of the disk of UX Tau C all point to a scenario in which UX Tau A has been perturbed very recently (similar to 1000 years) by the close passage of UX Tau C.
  • No Thumbnail Available
    Item
    The ultra-hot-Jupiter KELT-16 b: dynamical evolution and atmospheric properties
    (2022) Mancini, L.; Southworth, J.; Naponiello, L.; Basturk, O.; Barbato, D.; Biagiotti, F.; Bruni, I; Cabona, L.; D'Ago, G.; Damasso, M.; Erdem, A.; Evans, D.; Henning, Th; Ozturk, O.; Ricci, D.; Sozzetti, A.; Tregloan-Reed, J.; Yalcinkaya, S.
    We present broad-band photometry of 30 planetary transits of the ultra-hot-Jupiter KELT-16 b, using five medium-class telescopes. The transits were monitored through standard B, V, R, I filters and four were simultaneously observed from different places, for a total of 36 new light curves. We used these new photometric data and those from the TESS space telescope to review the main physical properties of the ICELT-16 planetary system. Our results agree with previous measurements but are more precise. We estimated the mid-transit times for each of these transits and combined them with others from the literature to obtain 69 epochs, with a time baseline extending over more than 4 yr, and searched for transit time variations. We found no evidence for a period change, suggesting a lower limit for orbital decay at 8 Myr, with a lower limit on the reduced tidal quality factor of Q(*)' > (1.9 +/- 0.8) x 10(5) with 95 per cent confidence. We built up an observational, low-resolution transmission spectrum of the planet, finding evidence of the presence of optical absorbers, although with a low significance. Using TESS data, we reconstructed the phase curve finding that KELT-16 b has a phase offset of 25.25 +/- 14.03 degrees E, a day- and night-side brightness temperature of 3190 +/- 61 K and 2668 +/- 56 K, respectively. Finally, we compared the flux ratio of the planet over its star at the TESS and Spitzer wavelengths with theoretical emission spectra, finding evidence of a temperature inversion in the planet's atmosphere, the chemical composition of which is preferably oxygen-rich rather than carbon-rich.