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천문우주과학 연구동향

천문우주과학과 관련된 국내외 상위 학술논문 및 특허 정보를 제공해 드립니다.

노바델피니 2013으로 부터 확장되고 있는 파이어 볼

The expanding fireball of Nova Delphini 2013
  • 작성자 : KASI
  • 작성일 : 2014-11-14
  • 조회수 : 3280
  • 저자G. H. Schaefer, T. ten Brummelaar et.al.
  • Absract



    A classical nova occurs when material accreting onto the surface of a white dwarf in a close binary system ignites in a thermonuclear runaway.Complex structures observed in the ejecta at late stages could resultfrominteractions with thecompanionduring thecommonenvelope phase. Alternatively, the explosion could be intrinsically bipolar, resulting froma localized ignition on the surface of thewhite dwarf or as a consequence of rotational distortion. Studying the structure of novae during the earliest phases is challenging because of the high spatial resolution needed to measure their small sizes. Here we report near-infrared interferometric measurements of the angular size of Nova Delphini 2013, starting one day after the explosion and continuing with extensive time coverage during the first 43 days. Changes in the apparent expansion rate can be explained by an explosion model consisting of an optically thick core surrounded by adiffuse envelope.The opticaldepth of the ejected material changes as it expands. We detect an ellipticity in the light distribution, suggesting a prolate or bipolar structure that develops as early as the second day.Combining the angular expansion rate with radial velocity measurements, we derive a geometric distance to the nova of 4.5460.59 kiloparsecs from the Sun.


  • 게재정보NATURE(2014.11.13)에 게재된 논문임
  • 첨부파일
  • 원 문http://www.nature.com/nature/journal/v515/n7526/pdf/nature13834.pdf
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