The β Pictoris b Hill sphere transit campaign: I. Photometric limits to dust and rings
| Autor: | B. Lomberg, S. N. Mellon, F. X. Schmider, L. Abe, Djamel Mékarnia, A. Agabi, Nicolas Crouzet, Y. de Pra, G. J. J. Talens, I. Laginja, M. Buttu, Michael J. Ireland, Eric E. Mamajek, E. J. W. de Mooij, M. Nowak, John I. Bailey, Remko Stuik, Ji Wang, Sylvestre Lacour, A.-M. Lagrange, S. R. Crawford, Rainer Kuschnig, L. Wang, Philippe Stee, Z. Hui, Ignas Snellen, Grant M. Kennedy, P. A. Strøm, A. Lecavelier des Etangs, Rudi B. Kuhn, Konstanze Zwintz, Matthew A. Kenworthy, Tristan Guillot, Patrick Dorval, Kevin B. Stevenson, Paul Kalas |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Gas giant
Stars: individual: β Pictoris Formation Individual Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics 01 natural sciences β Pictoris Planets and satellites: rings Planet 0103 physical sciences Astrophysics::Solar and Stellar Astrophysics Rings Solar and Stellar Astrophysics Transit (astronomy) 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics Physics 010308 nuclear & particles physics Astrophysics::Instrumentation and Methods for Astrophysics Planets and Satellites Astronomy and Astrophysics Radius Planets and satellites: formation Planetary system Light curve Stars Astrophysics - Solar and Stellar Astrophysics 13. Climate action Space and Planetary Science Asteroid Hill sphere Earth and Planetary Astrophysics Astrophysics::Earth and Planetary Astrophysics Astrophysics - Earth and Planetary Astrophysics |
| Zdroj: | Astronomy and Astrophysics, 648 |
| Popis: | Photometric monitoring of Beta Pictoris in 1981 showed anomalous fluctuations of up to 4% over several days, consistent with foreground material transiting the stellar disk. The subsequent discovery of the gas giant planet Beta Pictoris b and the predicted transit of its Hill sphere to within 0.1 au projected distance of the planet provided an opportunity to search for the transit of a circumplanetary disk in this $21\pm 4$ Myr-old planetary system. Continuous broadband photometric monitoring of Beta Pictoris requires ground-based observatories at multiple longitudes to provide redundancy and to provide triggers for rapid spectroscopic followup. These observatories include the dedicated Beta Pictoris monitoring observatory bRing at Sutherland and Siding Springs, the ASTEP400 telescope at Concordia, and observations from the space observatories BRITE and Hubble Space Telescope. We search the combined light curves for evidence of short period transient events caused by rings and for longer term photometric variability due to diffuse circumplanetary material. We find no photometric event that matches with the event seen in November 1981, and there is no systematic photometric dimming of the star as a function of the Hill sphere radius. We conclude that the 1981 event was not caused by the transit of a circumplanetary disk around Beta Pictoris b. The upper limit on the long term variability of Beta Pictoris places an upper limit of $1.8\times 10^{22}$ g of dust within the Hill sphere. Circumplanetary material is either condensed into a non-transiting disk, is condensed into a disk with moons that has a small obliquity, or is below our detection threshold. This is the first time that a dedicated international campaign has mapped the Hill sphere transit of a gas giant extrasolar planet at 10 au. Comment: 12 pages, 9 figures, 1 table, accepted for publication in A&A. Reduced data and reduction scripts on GitHub at https://github.com/mkenworthy/beta_pic_b_hill_sphere_transit |
| Databáze: | OpenAIRE |
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