Nondetections of Helium in the Young Sub-Jovian Planets K2-100b, HD 63433b, and V1298 Tau c

被引：2

作者：

Alam, Munazza K. ^{[1
,2
]}

Kirk, James ^{[3
,4
]}

Dos Santos, Leonardo A. ^{[1
]}

McCreery, Patrick ^{[5
]}

Allan, Andrew P. ^{[6
]}

Owen, James E. ^{[3
]}

Vidotto, Aline A. ^{[6
]}

Allart, Romain ^{[7
]}

Bourrier, Vincent ^{[8
]}

Espinoza, Nestor ^{[1
]}

King, George W. ^{[9
]}

Lopez-Morales, Mercedes ^{[4
]}

Seidel, Julia V. ^{[10
]}

机构：

[1] Space Telescope Sci Inst, 3700 San Martin Dr, Baltimore, MD 21218 USA

[2] Carnegie Earth & Planets Lab, 5241 Broad Branch Rd NW, Washington, DC 20015 USA

[3] Imperial Coll London, Dept Phys, Prince Consort Rd, London SW7 2AZ, England

[4] Ctr Astrophys Harvard & Smithsonian, 60 Garden St, Cambridge, MA 02138 USA

[5] Johns Hopkins Univ, William H Miller III Dept Phys & Astron, Baltimore, MD 21218 USA

[6] Leiden Univ, Leiden Observ, POB 9513, NL-2300 RA Leiden, Netherlands

[7] Univ Montreal, Inst Trottier Rech Exoplanetes, Dept Phys, Montreal, PQ H3T 1J4, Canada

[8] Observ Astron Univ Geneve, Chemin Pegasi 51b, CH-1290 Versoix, Switzerland

[9] Univ Michigan, Dept Astron, Ann Arbor, MI 48109 USA

[10] European Southern Observ, Alonso de Cordova 3107, Vitacura, Region Metropol, Albania

来源：

ASTRONOMICAL JOURNAL | 2024年 / 168卷 / 03期

基金：

欧洲研究理事会; 瑞士国家科学基金会;

关键词：

DWARF SPECTROSCOPIC SURVEY; EXTENDED UPPER-ATMOSPHERE; MASS-LOSS; HE-I; EXOPLANET ATMOSPHERES; ESCAPING HELIUM; RADIUS DISTRIBUTION; TESS HUNT; LY-ALPHA; STARS;

D O I：

10.3847/1538-3881/ad50d4

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We search for excess in-transit absorption of neutral helium at 1.083 mu m in the atmospheres of the young (<800 Myr) sub-Jovian (0.2-0.5 R-J) planets HD 63433b, K2-100b, and V1298 Tau c using high-resolution (R similar to 25,000) transit observations taken with Keck II/NIRSPEC. Our observations do not show evidence of helium absorption for any of the planets in our sample. We calculate 3 sigma upper limits on the planets' excess helium absorption of <0.47% for HD 63433b, <0.56% for K2-100b, and <1.13% for V1298 Tau c. In terms of equivalent width, we constrain these to <2.52, <4.44, and <8.49 m & Aring; for HD 63433b, K2-100b, and V1298 Tau c, respectively. We fit our transmission spectra with one-dimensional Parker wind models to determine upper limits on the planets' mass-loss rates of <7.9 x 10(10), <1.25 x 10(11), and <7.9 x 10(11)g s(-1). Our nondetections align with expectations from one-dimensional hydrodynamic escape models, magnetic fields, and stellar wind confinement. The upper limits we measure for these planets are consistent with predicted trends in system age and He equivalent width from 1D hydrodynamic models.

引用

页数：18