CaRM: Exploring the chromatic Rossiter-McLaughlin effect The cases of HD 189733b and WASP-127b

被引：7

作者：

Cristo, E. ^{[1
,2
]}

Santos, N. C. ^{[1
,2
]}

Demangeon, O. ^{[1
,2
]}

Martins, J. H. C. ^{[1
,2
]}

Figueira, P. ^{[1
,3
]}

Casasayas-Barris, N. ^{[4
,5
]}

Zapatero Osorio, M. R. ^{[6
]}

Borsa, F. ^{[7
]}

Sousa, S. G. ^{[1
]}

Oshagh, M. ^{[4
,5
]}

Micela, G. ^{[8
]}

Tabernero, H. M. ^{[6
]}

Seidel, J., V ^{[9
]}

Cristiani, S. ^{[10
]}

Pepe, F. ^{[9
]}

Rebolo, R. ^{[4
,5
,11
]}

Adibekyan, V ^{[1
,2
]}

Allart, R. ^{[9
,12
,13
]}

Alibert, Y. ^{[14
]}

Azevedo Silva, T. ^{[1
,2
]}

Bourrier, V ^{[9
]}

Cabral, A. ^{[15
,16
]}

Esparza-Borges, E. ^{[4
,5
]}

Gonzalez Hernandez, J., I ^{[4
,5
]}

Lillo-Box, J. ^{[6
]}

Lo Curto, G. ^{[3
]}

Lovis, C. ^{[9
]}

Manescau, A. ^{[17
]}

Di Marcantonio, P. ^{[10
]}

Martins, C. J. A. P. ^{[1
,18
]}

Megevand, D. ^{[9
]}

Mehner, A. ^{[3
]}

Nunes, N. J. ^{[15
]}

Palle, E. ^{[5
,19
]}

Sozzetti, A. ^{[20
]}

Suarez Mascareno, A. ^{[4
,5
]}

Udry, S. ^{[9
]}

机构：

[1] Univ Porto, Inst Astrofis & Ciencias Espaco, CAUP, Rua Estrelas, P-4150762 Porto, Portugal

[2] Univ Porto, Dept Fis & Astron, Fac Ciencias, Rua Campo Alegre, P-4169007 Porto, Portugal

[3] European Southern Observ, Alonso de Cordova 3107, Vitacura 3107, Regi N Metropol, Chile

[4] Inst Astrofis Canarias IAC, San Cristobal la Laguna 38205, Tenerife, Spain

[5] Univ La Laguna ULL, Dept Astrofis, San Cristobal la Laguna 38206, Tenerife, Spain

[6] CSIC, Ctr Astrobiol, INTA, Crta Ajalvir Km 4, Madrid 28850, Spain

[7] INAF Osservatorio Astron Brera, Via Bianchi 46, I-23807 Merate, Italy

[8] INAF Osservatorio Astron Palermo, Piazza Parlamento 1, I-90134 Palermo, Italy

[9] Univ Geneva, Dept Astron, Chemin Pegasi 51, CH-1290 Versoix, Switzerland

[10] INAF Osservatorio Astron Trieste, Via GB Tiepolo 11, I-34143 Trieste, Italy

[11] CSIC, Barcelona, Spain

[12] Univ Montreal, Dept Phys, Montreal, PQ H3T 1J4, Canada

[13] Univ Montreal, Inst Res Exoplanets, Montreal, PQ H3T 1J4, Canada

[14] Univ Bern, Phys Inst, Sidlerstr 5, CH-3012 Bern, Switzerland

[15] Univ Lisbon, Inst Astrofis & Ciencias Espaco, Fac Ciencias, P-1749016 Lisbon, Portugal

[16] Univ Lisbon, Fac Ciencias, Dept Fis, Edificio C8, P-1749016 Lisbon, Portugal

[17] European Southern Observ, Karl Schwarzschild Str 2, D-85748 Garching, Germany

[18] Univ Porto, Ctr Astrofis, Rua Estrelas, P-4150762 Porto, Portugal

[19] Inst Astrofis Canarias IAC, San Cristobal la Laguna 38200, Tenerife, Spain

[20] INAF Osservatorio Astrofis Torino, Via Osservatorio 20, I-10025 Pino Torinese, Italy

来源：

ASTRONOMY & ASTROPHYSICS | 2022年 / 660卷

基金：

瑞士国家科学基金会; 欧洲研究理事会;

关键词：

planets and satellites: atmospheres; techniques: spectroscopic; HOT-JUPITER; TRANSMISSION SPECTRUM; EXTRASOLAR PLANET; STELLAR ACTIVITY; TRANSIT; SPECTROSCOPY; ATMOSPHERE; VELOCITY; SIGNATURE; ESPRESSO;

D O I：

10.1051/0004-6361/202142353

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Aims. In this paper we introduce CaRM, a semi-automatic code for the retrieval of broadband transmission spectra of transiting planets through the chromatic Rossiter-McLaughlin method. We applied it to HARPS and ESPRESSO observations of two exoplanets to retrieve the transmission spectrum and we analyze its fitting transmission models. Methods. We used the strong radius dependence of the Rossiter-McLaughlin (RM) effect amplitude, caused by planetary companions, to measure the apparent radius change caused by the exoplanet atmosphere. In order to retrieve the transmission spectrum, the radial velocities, which were computed over wavelength bins that encompass several spectral orders, were used to simultaneously fit the Keplerian motion and the RM effect. From this, the radius ratio was computed as a function of the wavelength, which allows one to retrieve the low-resolution broadband transmission spectrum of a given exoplanet. CaRM offers the possibility to use two Rossiter-McLaughlin models taken from ARoME and PyAstronomy, associated with a Keplerian function to fit radial velocities during transit observations automatically. Furthermore it offers the possibility to use some methods that could, in theory, mitigate the effect of perturbation in the radial velocities during transits. Results. We applied CaRM to recover the transmission spectrum of HD 189733b and WASP-127b, with HARPS and ESPRESSO data, respectively. Our results for HD 189733b suggest that the blue part of the spectrum is dominated by Rayleigh scattering, which is compatible with former studies. The analysis of WASP-127b shows a flat transmission spectrum. Conclusions. The CaRM code allows one to retrieve the transmission spectrum of a given exoplanet using minimal user interaction. We demonstrate that it allows one to compute the low-resolution broadband transmission spectra of exoplanets observed using high-resolution spectrographs such as HARPS and ESPRESSO.

引用

页数：18

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