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arXiv 2007.06410astro-ph.EPastro-ph.SR
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$π$ Men行星系的精确结构表征

A precise architecture characterization of the $π$ Men planetary system

M. Damasso, A. Sozzetti, C. Lovis, S. C. C. Barros, S. G. Sousa, O. D. S. Demangeon, J. P. Faria, J. Lillo-Box, S. Cristiani, F. Pepe, R. Rebolo, N. C. Santos, … 展开作者

M. Damasso, A. Sozzetti, C. Lovis, S. C. C. Barros, S. G. Sousa, O. D. S. Demangeon, J. P. Faria, J. Lillo-Box, S. Cristiani, F. Pepe, R. Rebolo, N. C. Santos, M. R. Zapatero Osorio, J. I. González Hernández, M. Amate, L. Pasquini, F. M. Zerbi, V. Adibekyan, M. Abreu, M. Affolter, Y. Alibert, M. Aliverti, R. Allart, C. Allende Prieto, D. Álvarez, D. Alves, G. Avila, V. Baldini, T. Bandy, W. Benz, A. Bianco, F. Borsa, D. Bossini, V. Bourrier, F. Bouchy, C. Broeg, A. Cabral, G. Calderone, R. Cirami, J. Coelho, P. Conconi, I. Coretti, C. Cumani, G. Cupani, V. D'Odorico, S. Deiries, H. Dekker, B. Delabre, P. Di Marcantonio, X. Dumusque, D. Ehrenreich, P. Figueira, A. Fragoso, L. Genolet, M. Genoni, R. Génova Santos, I. Hughes, O. Iwert, F. Kerber, J. Knudstrup, M. Landoni, B. Lavie, J. -L. Lizon, G. Lo Curto, C. Maire, C. J . A. P. Martins, D. Mégevand, A. Mehner, G. Micela, A. Modigliani, P. Molaro, M. A. Monteiro, M. J. P. F. G. Monteiro, M. Moschetti, E. Mueller, M. T. Murphy, N. Nunes, L. Oggioni, A. Oliveira, M. Oshagh, E. Pallé, G. Pariani, E. Poretti, J. L. Rasilla, J. Rebordão, E. M. Redaelli, M. Riva, S. Santana Tschudi, P. Santin, P. Santos, D. Ségransan, T. M. Schmidt, A. Segovia, D. Sosnowska, P. Spanò, A. Suárez Mascareño, H. Tabernero, F. Tenegi, S. Udry, A. Zanutta

摘要:

明亮的恒星$π$ Men被选为径向速度跟踪的第一个目标,以测试ESO的性能,ESO的超大望远镜(VLT)的新高分辨率摄谱仪。这颗恒星拥有一个多行星系统(一颗在$\sim$ 0.07天文单位的过境4 M $_\oplus$行星,以及一颗在$\sim$ 2100天偏心轨道上的亚恒星伴星),这对于精确的多技术表征特别有吸引力。通过新的ESTERO观测,涵盖了200天的时间跨度,我们的目标是提高行星参数的精度和准确性,并寻找更多的低质量同伴。我们还利用TESS观察到的$π$ Men c在与ESTERO后续活动重叠的时间跨度内的新光度过境。我们分析了放大的光谱和光度数据集,并将结果与文献中的结果进行比较。我们进一步描述了系统的绝对天体测量与依巴谷和盖亚。我们用ESTO的光谱独立测定恒星的基本参数。我们提出了一个精确的表征行星系周围的$π$男子。单独的ESTERO径向速度(典型的不确定性为10 cm/s)允许精确检索由$π$ Men c.残差显示RMS为1.2 m/s,我们可以排除$π$ Men c)轨道内最小质量小于$\sim$ 2 M $_\oplus$的伴星。我们使用18个额外的TESS凌日改进了$π$ Men c的星历,并结合天体测量,我们以高精度($i_{b}=45.8^{+1.4}_{-1.1}$ deg)确定了$π$ Men b的轨道平面倾角。这导致了它的绝对质量$m_{b}=14.1^{+0.5}_{-0.4}$ M $_{Jup}$的精确测量,并表明行星轨道平面高度错位。

英文摘要:

The bright star $π$ Men was chosen as the first target for a radial velocity follow-up to test the performance of ESPRESSO, the new high-resolution spectrograph at the ESO's Very-Large Telescope (VLT). The star hosts a multi-planet system (a transiting 4 M$_\oplus$ planet at $\sim$0.07 au, and a sub-stellar companion on a $\sim$2100-day eccentric orbit) which is particularly appealing for a precise multi-technique characterization. With the new ESPRESSO observations, that cover a time span of 200 days, we aim to improve the precision and accuracy of the planet parameters and search for additional low-mass companions. We also take advantage of new photometric transits of $π$ Men c observed by TESS over a time span that overlaps with that of the ESPRESSO follow-up campaign. We analyse the enlarged spectroscopic and photometric datasets and compare the results to those in the literature. We further characterize the system by means of absolute astrometry with Hipparcos and Gaia. We used the spectra of ESPRESSO for an independent determination of the stellar fundamental parameters. We present a precise characterization of the planetary system around $π$ Men. The ESPRESSO radial velocities alone (with typical uncertainty of 10 cm/s) allow for a precise retrieval of the Doppler signal induced by $π$ Men c. The residuals show an RMS of 1.2 m/s, and we can exclude companions with a minimum mass less than $\sim$2 M$_\oplus$ within the orbit of $π$ Men c). We improve the ephemeris of $π$ Men c using 18 additional TESS transits, and in combination with the astrometric measurements, we determine the inclination of the orbital plane of $π$ Men b with high precision ($i_{b}=45.8^{+1.4}_{-1.1}$ deg). This leads to the precise measurement of its absolute mass $m_{b}=14.1^{+0.5}_{-0.4}$ M$_{Jup}$, and shows that the planetary orbital planes are highly misaligned.

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。

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