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Fast spectrophotome...
Fast spectrophotometry of WD 1145+017
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- Izquierdo, Paula (författare)
- University of La Laguna (ULL),Instituto de Astrofísica de Canarias
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- Rodriguez-Gil, Pablo (författare)
- University of La Laguna (ULL),Instituto de Astrofísica de Canarias
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- Gänsicke, Boris T. (författare)
- University of Warwick
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- Mustill, Alexander J. (författare)
- Lund University,Lunds universitet,Astronomi - Genomgår omorganisation,Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation,Naturvetenskapliga fakulteten,Lund Observatory - Undergoing reorganization,Department of Astronomy and Theoretical Physics - Undergoing reorganization,Faculty of Science
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- Toloza, Odette (författare)
- University of Warwick
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- Tremblay, Pier-Emmanuel (författare)
- University of Warwick
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- Wyatt, Mark C (författare)
- University of Cambridge
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- Chote, Paul (författare)
- University of Warwick
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- Eggl, Siegfried (författare)
- California Institute of Technology
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- Farihi, Jay (författare)
- University College London
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- Koester, Detlev (författare)
- University of Kiel
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- Lyra, Wladimir (författare)
- California State University Northridge,California Institute of Technology
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- Manser, Christopher J. (författare)
- University of Warwick
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- Marsh, Thomas R. (författare)
- University of Warwick
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- Pallé, Enric (författare)
- University of La Laguna (ULL),Instituto de Astrofísica de Canarias
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- Raddi, Roberto (författare)
- Friedrich-Alexander University Erlangen-Nürnberg
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- Veras, Dimitri (författare)
- University of Warwick
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- Villaver, Eva (författare)
- Autonomous University of Madrid
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- Portegies Zwart, Simon (författare)
- Leiden University
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(creator_code:org_t)
- 2018-08-24
- 2018
- Engelska 12 s.
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Ingår i: Monthly Notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 481:1, s. 703-714
- Relaterad länk:
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https://arxiv.org/ab... (free)
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http://dx.doi.org/10...
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http://wrap.warwick....
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https://lup.lub.lu.s...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- WD 1145+017 is currently the only white dwarf known to exhibit periodic transits of planetary debris as well as absorption lines from circumstellar gas. We present the first simultaneous fast optical spectrophotometry and broad-band photometry of the system, obtained with the Gran Telescopio Canarias (GTC) and the Liverpool Telescope, respectively. The observations spanned 5.5 h, somewhat longer than the 4.5-h orbital period of the debris. Dividing the GTC spectrophotometry into five wavelength bands reveals no significant colour differences, confirming grey transits in the optical. We argue that absorption by an optically thick structure is a plausible alternative explanation for the achromatic nature of the transits that can allow the presence of small-sized (~µm) particles. The longest (87 min) and deepest (50 per cent attenuation) transit recorded in our data exhibits a complex structure around minimum light that can be well modelled by multiple overlapping dust clouds. The strongest circumstellar absorption line, Fe II λ5169, significantly weakens during this transit, with its equivalent width reducing from a mean out-of-transit value of 2 to 1 Å in-transit, supporting spatial correlation between the circumstellar gas and dust. Finally, we made use of the Gaia Data Release 2 and archival photometry to determine the white dwarf parameters. Adopting a helium-dominated atmosphere containing traces of hydrogen and metals, and a reddening E(B - V) = 0.01 we find T_eff=15 020 ± 520 K, log g = 8.07 ± 0.07, corresponding to M_WD=0.63± 0.05 M☉ and a cooling age of 224 ± 30 Myr.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- minor planets
- asteroids: general
- planets and satellites: physical evolution
- planet-star interactions
- planetary systems
- white dwarfs
- Astrophysics - Solar and Stellar Astrophysics
- Astrophysics - Earth and Planetary Astrophysics
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
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- Av författaren/redakt...
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Izquierdo, Paula
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Rodriguez-Gil, P ...
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Gänsicke, Boris ...
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Mustill, Alexand ...
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Toloza, Odette
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Tremblay, Pier-E ...
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visa fler...
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Wyatt, Mark C
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Chote, Paul
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Eggl, Siegfried
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Farihi, Jay
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Koester, Detlev
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Lyra, Wladimir
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Manser, Christop ...
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Marsh, Thomas R.
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Pallé, Enric
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Raddi, Roberto
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Veras, Dimitri
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Villaver, Eva
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Portegies Zwart, ...
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