The only inflated brown dwarf in an eclipsing white dwarf-brown dwarf binary: WD1032+011B

被引：2

作者：

French, Jenni R. ^{[1
]}

Casewell, Sarah L. ^{[1
]}

Amaro, Rachael C. ^{[2
,3
]}

Lothringer, Joshua D. ^{[4
]}

Mayorga, L. C. ^{[5
]}

Littlefair, Stuart P. ^{[6
]}

Lew, Ben W. P. ^{[7
,8
]}

Zhou, Yifan ^{[9
]}

Apai, Daniel ^{[2
,3
,10
]}

Marley, Mark S. ^{[10
]}

Parmentier, Vivien ^{[11
,12
]}

Tan, Xianyu ^{[13
,14
]}

机构：

[1] Univ Leicester, Ctr Exoplanet Res, Sch Phys & Astron, Univ Rd, Leicester LE1 7RH, England

[2] Univ Arizona, Dept Astron, 933 North Cherry Ave, Tucson, AZ 85721 USA

[3] Univ Arizona, Steward Observ, 933 North Cherry Ave, Tucson, AZ 85721 USA

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

[5] Johns Hopkins Univ, Appl Phys Lab, 11100 Johns Hopkins Rd, Laurel, MD 20723 USA

[6] Univ Sheffield, Dept Phys & Astron, Sheffield S3 7RH, England

[7] Bay Area Environm Res Inst, Moffett Field, CA 94035 USA

[8] NASA, Ames Res Ctr, Moffett Field, CA 94035 USA

[9] Univ Virginia, Dept Astron, 530 McCormick Rd, Charlottesville, VA 22904 USA

[10] Univ Arizona, Lunar & Planetary Lab, 1629 East Univ Blvd, Tucson, AZ 85721 USA

[11] Univ Oxford, Dept Phys, Atmospher Ocean & Planetary Phys, Parks Rd, Oxford OX1 3PU, England

[12] Univ Cote Azur, Observ Cote Azur, CNRS, Lab Lagrange, F-06903 Nice, France

[13] Shanghai Jiao Tong Univ, Tsung Dao Lee Inst, Shanghai 201210, Peoples R China

[14] Shanghai Jiao Tong Univ, Sch Phys & Astron, Shanghai 201210, Peoples R China

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2024年 / 534卷 / 03期

基金：

英国科学技术设施理事会;

关键词：

binaries: eclipsing; brown dwarfs; white dwarfs; PHASE-RESOLVED SPECTROSCOPY; HOT-JUPITER; ATMOSPHERIC CIRCULATION; GIANT PLANETS; CONVECTIVE BOUNDARIES; CATACLYSMIC VARIABLES; STELLAR COMPANIONS; NIGHTSIDE CLOUDS; MOTION SURVEY; GAS GIANTS;

D O I：

10.1093/mnras/stae2121

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Due to their short orbital periods and relatively high-flux ratios, irradiated brown dwarfs in binaries with white dwarfs offer better opportunities to study irradiated atmospheres than hot Jupiters, which have lower planet-to-star flux ratios. WD1032+011 is an eclipsing, tidally locked white dwarf-brown dwarf binary with a 9950 K white dwarf orbited by a 69.7 M-Jup brown dwarf in a 0.09 d orbit. We present time-resolved Hubble Space Telescope Wide Field Camera 3 spectrophotometric data of WD1032+011. We isolate the phase-dependent spectra of WD1032+011B, finding a 210 K difference in brightness temperature between the dayside and nightside. The spectral type of the brown dwarf is identified as L1 peculiar, with atmospheric retrievals and comparison to field brown dwarfs showing evidence for a cloud-free atmosphere. The retrieved temperature of the dayside is 1748(-67)(+66) K, with a nightside temperature of 1555(-62)(+76) K, showing an irradiation-driven temperature contrast coupled with inefficient heat redistribution from the dayside to the nightside. The brown dwarf radius is inflated, likely due to the constant irradiation from the white dwarf, making it the only known inflated brown dwarf in an eclipsing white dwarf-brown dwarf binary.

引用

页码：2244 / 2262

页数：19

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