Piercing the Glare: Direct Imaging Search for Planets in the Sirius System
Astrometric monitoring of the Sirius binary system over the past century has yielded several predictions for an unseen third system component, the most recent one suggesting a \leq50 MJup object in a ~6.3-year orbit around Sirius A. Here we present two epochs of high-contrast imaging observations pe...
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| Veröffentlicht in: | arXiv.org 2011-04 |
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| creator | Thalmann, Christian Usuda, Tomonori Kenworthy, Matthew Janson, Markus Mamajek, Eric E Brandner, Wolfgang Dominik, Carsten Goto, Miwa Hayano, Yutaka Henning, Thomas Hinz, Phil M Minowa, Yosuke Tamura, Motohide |
| description | Astrometric monitoring of the Sirius binary system over the past century has yielded several predictions for an unseen third system component, the most recent one suggesting a \leq50 MJup object in a ~6.3-year orbit around Sirius A. Here we present two epochs of high-contrast imaging observations performed with Subaru IRCS and AO188 in the 4.05 \mum narrow-band Br alpha filter. These data surpass previous observations by an order of magnitude in detectable companion mass, allowing us to probe the relevant separation range down to the planetary mass regime (6-12 M_Jup at 1", 2-4 M_Jup at 2", and 1.6 M_Jup beyond 4"). We complement these data with one epoch of M-band observations from MMT/AO Clio, which reach comparable performance. No dataset reveals any companion candidates above the 5-sigma level, allowing us to refute the existence of Sirius C as suggested by the previous astrometric analysis. Furthermore, our Br alpha photometry of Sirius B confirms the lack of an infrared excess beyond the white dwarf's blackbody spectrum. |
| doi_str_mv | 10.48550/arxiv.1104.1427 |
| format | Article |
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Here we present two epochs of high-contrast imaging observations performed with Subaru IRCS and AO188 in the 4.05 \mum narrow-band Br alpha filter. These data surpass previous observations by an order of magnitude in detectable companion mass, allowing us to probe the relevant separation range down to the planetary mass regime (6-12 M_Jup at 1", 2-4 M_Jup at 2", and 1.6 M_Jup beyond 4"). We complement these data with one epoch of M-band observations from MMT/AO Clio, which reach comparable performance. No dataset reveals any companion candidates above the 5-sigma level, allowing us to refute the existence of Sirius C as suggested by the previous astrometric analysis. 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| subjects | Blackbody Companion stars Infrared photometry Photometry Physics - Earth and Planetary Astrophysics Physics - Solar and Stellar Astrophysics Piercing Planet detection Planetary mass White dwarf stars |
| title | Piercing the Glare: Direct Imaging Search for Planets in the Sirius System |
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