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A young white dwarf with an infrared excess
| Indexado |
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| DOI | 10.1088/2041-8205/806/1/L5 | ||||
| Año | 2015 | ||||
| Tipo | artículo de investigación |
Citas Totales
Autores Afiliación Chile
Instituciones Chile
% Participación
Internacional
Autores
Afiliación Extranjera
Instituciones
Extranjeras
Abstract
Using observations of Spitzer/IRAC, we report the serendipitous discovery of excess infrared emission from a single white dwarf PG 0010+280. At a temperature of 27,220 K and a cooling age of 16 Myr, it is the hottest and youngest white dwarf to display an excess at 3-8 mu m. The infrared excess can be fit by either an opaque dust disk within the tidal radius of the white dwarf or a 1300 K blackbody, possibly from an irradiated substellar object or a re-heated giant planet. PG 0010+280 has two unique properties that are different from white dwarfs with a dust disk: (i) relatively low emission at 8 mu m and (ii) non-detection of heavy elements in its atmosphere from high-resolution spectroscopic observations with Keck/HIRES. The origin of the infrared excess remains unclear.
| Ord. | Autor | Género | Institución - País |
|---|---|---|---|
| 1 | Xu, Siyi | - |
UNIV CALIF LOS ANGELES - Estados Unidos
ESO - Alemania University of California, Los Angeles - Estados Unidos Observatorio Europeo Austral - Alemania |
| 2 | Jura, M. | - |
UNIV CALIF LOS ANGELES - Estados Unidos
University of California, Los Angeles - Estados Unidos |
| 3 | Pantoja, B. | - |
Universidad de Chile - Chile
UNIV LOUISVILLE - Estados Unidos |
| 4 | Klein, B. | Hombre |
UNIV CALIF LOS ANGELES - Estados Unidos
University of California, Los Angeles - Estados Unidos |
| 5 | Zuckerman, Ben | - |
UNIV CALIF LOS ANGELES - Estados Unidos
University of California, Los Angeles - Estados Unidos |
| 6 | Su, Kate Y. L. | Mujer |
UNIV ARIZONA - Estados Unidos
The University of Arizona - Estados Unidos |
| 7 | Meng, Huan Y. A. | - |
UNIV ARIZONA - Estados Unidos
The University of Arizona - Estados Unidos |
| 7 | Meng, H. Y.A. | - |
The University of Arizona - Estados Unidos
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| Fuente |
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| National Science Foundation |
| NASA |
| W.M. Keck Foundation |
| University of Arizona, and Lockheed Martin Advanced Technology Center |
| REU program |
| Directorate for Mathematical and Physical Sciences |
| Agradecimiento |
|---|
| The authors thank an anonymous referee for helpful comments. We thank D. Koester for calculating the accretion flux in PG 0010+280, A. Gianninas for useful email exchanges on using TLUSTY & SYNSPEC, M. Irwin for discussing the CASU data reduction pipeline, and M. Petr-Gotzens for helpful discussion on model atmospheres of substellar objects. The paper is based in part on observations made with (1) Spitzer, which is operated by JPL, Caltech under a contract with NASA; (2) WISE, which is a joint project of UCLA and JPL/Caltech, funded by NASA; (3) data obtained at the UKIRT, which is supported by NASA and operated under an agreement among the University of Hawaii, the University of Arizona, and Lockheed Martin Advanced Technology Center; operations are enabled through the cooperation of the Joint Astronomy Centre of the Science and Technology Facilities Council of the U.K.; (4) Keck telescope, which is operated as a scientific partnership among the Caltech, the University of California and NASA. The Observatory was made possible by the generous financial support of the W.M. Keck Foundation. The authors also wish to recognize and acknowledge the very significant cultural role and reverence that the summit of Mauna Kea has always had within the indigenous Hawaiian community. We are most fortunate to have the opportunity to conduct observations from this mountain. This material is partly based upon work supported by the National Science Foundation and REU program. |
