当前位置: X-MOL 学术Mon. Not. R. Astron. Soc. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Confirming new white dwarf-ultracool dwarf binary candidates
Monthly Notices of the Royal Astronomical Society ( IF 4.8 ) Pub Date : 2020-08-10 , DOI: 10.1093/mnras/staa2233
M A Hogg 1 , S L Casewell 1 , G A Wynn 1 , E S Longstaff 1, 2 , I P Braker 1 , M R Burleigh 1 , R H Tilbrook 1 , S Geier 3 , D Koester 4 , J H Debes 5 , N Lodieu 6, 7
Affiliation  

We present the results of a study to discover prospective new white dwarf-L dwarf binaries as identified by their near-infrared excesses in the UKIDSS catalogue. We obtained optical spectra to validate the white dwarf nature for 22 of the candidate primary stars, confirming ten as white dwarfs and determining their effective temperatures and gravities. For all 10 white dwarfs, we determined that the near-infrared excess was indeed indicative of a cool companion. Six of these are suggestive of late M dwarf companions, and three are candidate L dwarf companions, with one straddling the M−L boundary. We also present near-infrared spectra of eight additional candidate white dwarf-ultracool dwarf binaries, where the white dwarf primary had been previously confirmed. These spectra indicate one candidate at the M−L boundary, three potential L dwarf companions, and one suspected M dwarf, which showed photometric variability on a ∼6 h period, suggesting the system may be close. Radial velocity follow-up is required to confirm whether these systems are close, or widely separated.

中文翻译:

确认新的白矮星-超冷矮星候选双星

我们展示了一项研究的结果,以发现在 UKIDSS 目录中通过其近红外过量识别的前瞻性新白矮星-L 矮双星。我们获得了光谱来验证 22 颗候选主星的白矮星性质,确认 10 颗为白矮星并确定它们的有效温度和重力。对于所有 10 颗白矮星,我们确定近红外过剩确实表明它有一个很酷的伴星。其中六个暗示着晚 M 矮伴星,三个是候选 L 矮伴星,其中一个跨越 M-L 边界。我们还展示了另外八颗候选白矮星-超冷矮双星的近红外光谱,其中的白矮星原形先前已被确认。这些光谱表明 ML 边界处的一个候选者,三个潜在的 L 矮星伴星和一个疑似 M 矮星,其在约 6 小时内显示出光度变化,表明该系统可能很接近。需要对径向速度进行跟踪以确认这些系统是接近还是分开。
更新日期:2020-08-10
down
wechat
bug