The ELM Survey South. II. Two Dozen New Low-mass White Dwarf Binaries
The ELM Survey South. II. Two Dozen New Low-mass White Dwarf Binaries
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DOI：
10.3847/1538-4357/acd187
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发表时间：
2023-05
期刊：
影响因子：
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通讯作者：
A. Kosakowski;Warren R. Brown;M. Kilic;T. Kupfer;Antoine B'edard;A. Gianninas;M. Agueros;Manuel Barrientos
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文献类型：
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作者：
A. Kosakowski;Warren R. Brown;M. Kilic;T. Kupfer;Antoine B'edard;A. Gianninas;M. Agueros;Manuel Barrientos
我们展示了我们正在进行的针对低质量白矮星双星的光谱调查的结果，重点关注南部天空。我们使用基于 Gaia DR2 和 eDR3 的选择，识别出 28 个新的双星，包括 19 个新的极低质量 (ELM) 白矮星、一个短周期、可能食的 DABZ 和两个潜在的 LISA 双星。我们根据光谱跟踪提供了每个新双星的轨道和大气参数。我们的四个新双星在 TESS 2 分钟节奏数据中显示出周期性光度变化，其中包括一个新的食双线光谱双星。另外三个在 ZTF 中显示出周期性的光度变化，其中包括一个新的食双星。我们根据高速光度跟踪观测的光曲线建模，对这些 ZTF 变量的倾角和缩放分量半径进行估计。我们的观测已将南部天空中发现的 ELM 巡天双星样本增加到 41 个，增加了 64%。未来的时域巡天，例如 BlackGEM 和 Vera C. Rubin 天文台遗产时空巡天，将有效识别南部天空的光度变量，并显着增加南部天空低质量白矮星双星的数量，从而使这些系统的全天空数量更加完整。
We present the results from our ongoing spectroscopic survey targeting low-mass white dwarf binaries, focusing on the southern sky. We used a Gaia DR2- and eDR3-based selection and identified 28 new binaries, including 19 new extremely low-mass (ELM) white dwarfs, one short period, likely eclipsing, DABZ, and two potential LISA binaries. We present the orbital and atmospheric parameters for each new binary based on our spectroscopic follow up. Four of our new binaries show periodic photometric variability in TESS 2 minutes cadence data, including one new eclipsing double-lined spectroscopic binary. Three others show periodic photometric variability in ZTF, including one new eclipsing binary. We provide estimates for the inclinations and scaled component radii for these ZTF variables, based on light-curve modeling of our high-speed photometric follow-up observations. Our observations have increased the sample of ELM Survey binaries identified in the southern sky to 41, an increase of 64%. Future time domain surveys, such as BlackGEM and the Vera C. Rubin Observatory Legacy Survey of Space and Time, will efficiently identify photometric variables in the southern sky and significantly increase the population of southern sky low-mass white dwarf binaries, leading to a more complete all-sky population of these systems.