arXiv 1202.00832012-02astro-ph.EPastro-ph.IMastro-ph.SR

GJ 436系统：直接测定M矮星的天体物理参数和对凌日热海王星的影响

The GJ 436 System: Directly Determined Astrophysical Parameters of an M-Dwarf and Implications for the Transiting Hot Neptune

Kaspar von Braun, Tabetha S. Boyajian, Stephen R. Kane, Leslie Hebb, Gerard T. van Belle, Chris Farrington, David R. Ciardi, Heather A. Knutson, Theo A. ten Bru… 展开作者

Kaspar von Braun, Tabetha S. Boyajian, Stephen R. Kane, Leslie Hebb, Gerard T. van Belle, Chris Farrington, David R. Ciardi, Heather A. Knutson, Theo A. ten Brummelaar, Mercedes Lopez-Morales, Harold A. McAlister, Gail Schaefer, Stephen Ridgway, Andrew Collier Cameron, P. J. Goldfinger, Nils H. Turner, Laszlo Sturmann, Judit Sturmann

备注：: 10 pages, 4 tables, 9 figures; accepted for publication in ApJ; incorporated referee's comments and associated changes
DOI：: 10.1088/0004-637X/753/2/171

阅读 PDF

arXiv 页面 ↗HTML 原文 ↗

摘要：

已知晚型矮星GJ 436拥有一颗海王星质量的行星，其轨道为2.6天。我们目前的干涉测量结果，直接确定恒星直径（$R_{\star} = 0.455 \pm 0.018 R_{\odot}$）和有效温度（$T_{\rm EFF} = 3416 \pm 54$ K）。我们结合我们的恒星参数与文献的时间序列数据，这使我们能够计算物理和轨道系统参数，包括GJ 436的恒星质量（$M_{\star} = 0.507^{+ 0.071}_{- 0.062} M_{\odot}$）和密度（$ρ_* = 5.37^{+ 0.30}_{- 0.27} ρ_\odot$），行星半径（$R_{p} = 0.369^{+ 0.015}_{- 0.015} R_{Jupiter}$），行星质量（$M_{p} = 0.078^{+ 0.007}_{- 0.008} M_{Jupiter}$），这意味着一个平均行星密度为$ρ_{p} = 1.55^{+ 0.12}_{- 0.10} ρ_{Jupiter}$。这些值通常与以前的文献估计的基础上假设的恒星质量和光度光变曲线拟合很好的协议。最后，我们研究了热海王星GJ 436 b的预期相位曲线，基于各种假设的行星大气中能量再分配的效率，并发现它可以与{ \it斯皮策}监测观测的约束。

英文摘要：

The late-type dwarf GJ 436 is known to host a transiting Neptune-mass planet in a 2.6-day orbit. We present results of our interferometric measurements to directly determine the stellar diameter ($R_{\star} = 0.455 \pm 0.018 R_{\odot}$) and effective temperature ($T_{\rm EFF} = 3416 \pm 54$ K). We combine our stellar parameters with literature time-series data, which allows us to calculate physical and orbital system parameters, including GJ 436's stellar mass ($M_{\star} = 0.507^{+ 0.071}_{- 0.062} M_{\odot}$) and density ($ρ_* = 5.37^{+ 0.30}_{- 0.27} ρ_\odot$), planetary radius ($R_{p} = 0.369^{+ 0.015}_{- 0.015} R_{Jupiter}$), planetary mass ($M_{p} = 0.078^{+ 0.007}_{- 0.008} M_{Jupiter}$), implying a mean planetary density of $ρ_{p} = 1.55^{+ 0.12}_{- 0.10} ρ_{Jupiter}$. These values are generally in good agreement with previous literature estimates based on assumed stellar mass and photometric light curve fitting. Finally, we examine the expected phase curves of the hot Neptune GJ 436b, based on various assumptions concerning the efficiency of energy redistribution in the planetary atmosphere, and find that it could be constrained with {\it Spitzer} monitoring observations.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

摘要：

英文摘要：

相关论文