恒星/亚恒星金牛座边界（TBOSS）巡天I：用Herschel测量的远红外盘辐射
The Taurus Boundary of Stellar/Substellar (TBOSS) Survey I: far-IR disk emission measured with Herschel
摘要：
利用Herschel/PACS观测到金牛座恒星形成区的134个低质量成员，它们跨越M4-L0光谱类型范围，覆盖了从低质量恒星到棕矮星的过渡。结合新的赫歇尔结果与其他计划，共有150个M4-L0金牛座成员的154个成员与赫歇尔观测。在150个目标中，7个I类成员中有7个，67个II类成员中有48个，76个III类目标中有3个测量到70 μ m的通量密度。对于检测到的ClassII对象，中位数70微米的通量密度水平下降的光谱类型，然而，相对于中心对象的流量密度过剩的分布并没有改变整个恒星/亚恒星边界在M4-L0范围。将70 μ m TBOSS值与K 0-M3 II类成员的结果连接起来，将导致第一次全面普查恒星形成区域恒星和亚恒星人口的全质谱远红外辐射，并且中位通量密度随着光谱类型的下降而下降，其趋势类似于中心天体预期的通量密度下降。SED构建的所有TBOSS目标覆盖的光学远红外范围和扩展到submm/mm的一个子集的源。基于对不同物理参数的影响的初步探索，倾斜度、刻度高度和张开对PACS通量密度的影响最大。从24 ~ 70 μ m的光谱指数中，我们确定了5个新的候选转捩盘。对于8个TBOSS靶的子集，陡峭的24 μ m到70 μ m的斜率可能是这些系统中截断盘的指示。最后，将TBOSS的结果与赫歇尔对蛇夫座褐矮星的研究进行比较，揭示了金牛座亚恒星群周围的圆盘比例较低。
英文摘要：
With Herschel/PACS 134 low mass members of the Taurus star-forming region spanning the M4-L0 spectral type range and covering the transition from low mass stars to brown dwarfs were observed. Combining the new Herschel results with other programs, a total of 150 of the 154 M4-L0 Taurus members members have observations with Herschel. Among the 150 targets, 70um flux densities were measured for 7 of the 7 ClassI objects, 48 of the 67 ClassII members, and 3 of the 76 ClassIII targets. For the detected ClassII objects, the median 70um flux density level declines with spectral type, however, the distribution of excess relative to central object flux density does not change across the stellar/substellar boundary in the M4-L0 range. Connecting the 70um TBOSS values with the results from K0-M3 ClassII members results in the first comprehensive census of far-IR emission across the full mass spectrum of the stellar and substellar population of a star-forming region, and the median flux density declines with spectral type in a trend analogous to the flux density decline expected for the central objects. SEDs were constructed for all TBOSS targets covering the optical to far-IR range and extending to the submm/mm for a subset of sources. Based on an initial exploration of the impact of different physical parameters; inclination, scale height and flaring have the largest influence on the PACS flux densities. From the 24um to 70um spectral index of the SEDs, 5 new candidate transition disks were identified. The steep 24um to 70um slope for a subset of 8 TBOSS targets may be an indication of truncated disks in these systems.Two examples of mixed pair systems that include secondaries with disks were measured. Finally, comparing the TBOSS results with a Herschel study of Ophiuchus brown dwarfs reveals a lower fraction of disks around the Taurus substellar population.
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