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http://hdl.handle.net/20.500.12386/30203
Titolo: | The HOSTS Survey—Exozodiacal Dust Measurements for 30 Stars | Autori: | Ertel, S. Defrère, D. Hinz, P. Mennesson, B. Kennedy, G. M. Danchi, W. C. Gelino, C. Hill, J. M. Hoffmann, W. F. Rieke, G. Shannon, A. Spalding, E. Stone, J. M. Vaz, A. Weinberger, A. J. Willems, P. Absil, O. Arbo, P. Bailey, V. P. Beichman, C. Bryden, G. Downey, E. C. Durney, O. ESPOSITO, Simone Gaspar, A. Grenz, P. Haniff, C. A. Leisenring, J. M. Marion, L. McMahon, T. J. Millan-Gabet, R. Montoya, M. Morzinski, K. M. PINNA, Enrico Power, J. PUGLISI, Alfio Timothy Roberge, A. Serabyn, E. Skemer, A. J. Stapelfeldt, K. Su, K. Y. L. Vaitheeswaran, V. Wyatt, M. C. |
Data pubblicazione: | 2018 | Rivista: | THE ASTRONOMICAL JOURNAL | Numero: | 155 | Fascicolo: | 5 | Da pagina:: | 194 | Abstract: | The Hunt for Observable Signatures of Terrestrial Systems survey searches for dust near the habitable zones (HZs) around nearby, bright main-sequence stars. We use nulling interferometry in the N band to suppress the bright stellar light and to probe for low levels of HZ dust around the 30 stars observed so far. Our overall detection rate is 18%, including four new detections, among which are the first three around Sun-like stars and the first two around stars without any previously known circumstellar dust. The inferred occurrence rates are comparable for early-type and Sun-like stars, but decrease from {60}<SUB>-21</SUB><SUP>+16</SUP>% for stars with previously detected cold dust to {8}<SUB>-3</SUB><SUP>+10</SUP>% for stars without such excess, confirming earlier results at higher sensitivity. For completed observations on individual stars, our sensitivity is five to ten times better than previous results. Assuming a lognormal excess luminosity function, we put upper limits on the median HZ dust level of 13 zodis (95% confidence) for a sample of stars without cold dust and of 26 zodis when focusing on Sun-like stars without cold dust. However, our data suggest that a more complex luminosity function may be more appropriate. For stars without detectable Large Binocular Telescope Interferometer (LBTI) excess, our upper limits are almost reduced by a factor of two, demonstrating the strength of LBTI target vetting for future exo-Earth imaging missions. Our statistics are limited so far, and extending the survey is critical to informing the design of future exo-Earth imaging surveys. | URI: | http://hdl.handle.net/20.500.12386/30203 | URL: | https://iopscience.iop.org/article/10.3847/1538-3881/aab717 | ISSN: | 0004-6256 | DOI: | 10.3847/1538-3881/aab717 | Bibcode ADS: | 2018AJ....155..194E | Fulltext: | open |
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