DETECTION OF MOLECULAR ABSORPTION IN THE DAYSIDE OF EXOPLANET 51 PEGASI b?
In this paper, we present ground-based high-resolution spectroscopy of 51 Pegasi using CRIRES at the Very Large Telescope. The system was observed for 3 × 5 hr at 2.3 μm at a spectral resolution of R = 100,000, targeting potential signatures from carbon monoxide, water vapor, and methane in the plan...
| Main Authors: | , , , , , |
|---|---|
| Other Authors: | |
| Format: | Article |
| Language: | en_US |
| Published: |
Institute of Physics/American Astronomical Society
2015
|
| Online Access: | http://hdl.handle.net/1721.1/94516 |
| _version_ | 1826194482374115328 |
|---|---|
| author | Brogi, M. Snellen, I. A. G. de Kok, R. J. Albrecht, Simon H. Birkby, J. L. de Mooij, E. J. W. |
| author2 | MIT Kavli Institute for Astrophysics and Space Research |
| author_facet | MIT Kavli Institute for Astrophysics and Space Research Brogi, M. Snellen, I. A. G. de Kok, R. J. Albrecht, Simon H. Birkby, J. L. de Mooij, E. J. W. |
| author_sort | Brogi, M. |
| collection | MIT |
| description | In this paper, we present ground-based high-resolution spectroscopy of 51 Pegasi using CRIRES at the Very Large Telescope. The system was observed for 3 × 5 hr at 2.3 μm at a spectral resolution of R = 100,000, targeting potential signatures from carbon monoxide, water vapor, and methane in the planet's dayside spectrum. In the first 2 × 5 hr of data, we find a combined signal from carbon monoxide and water in absorption at a formal 5.9σ confidence level, indicating a non-inverted atmosphere. We derive a planet mass of M [subscript P] = (0.46 ± 0.02)M [subscript Jup] and an orbital inclination i between 79fdg6 and 82fdg2, with the upper limit set by the non-detection of the planet transit in previous photometric monitoring. However, there is no trace of the signal in the final five hours of data. A statistical analysis indicates that the signal from the first two nights is robust, but we find no compelling explanation for its absence in the final night. The latter suffers from stronger noise residuals and greater instrumental instability than the first two nights, but these cannot fully account for the missing signal. It is possible that the integrated dayside emission from 51 Peg b is instead strongly affected by weather. However, more data are required before we can claim any time variability in the planet's atmosphere. |
| first_indexed | 2024-09-23T09:56:28Z |
| format | Article |
| id | mit-1721.1/94516 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T09:56:28Z |
| publishDate | 2015 |
| publisher | Institute of Physics/American Astronomical Society |
| record_format | dspace |
| spelling | mit-1721.1/945162022-09-30T17:51:05Z DETECTION OF MOLECULAR ABSORPTION IN THE DAYSIDE OF EXOPLANET 51 PEGASI b? Brogi, M. Snellen, I. A. G. de Kok, R. J. Albrecht, Simon H. Birkby, J. L. de Mooij, E. J. W. MIT Kavli Institute for Astrophysics and Space Research Albrecht, Simon H. In this paper, we present ground-based high-resolution spectroscopy of 51 Pegasi using CRIRES at the Very Large Telescope. The system was observed for 3 × 5 hr at 2.3 μm at a spectral resolution of R = 100,000, targeting potential signatures from carbon monoxide, water vapor, and methane in the planet's dayside spectrum. In the first 2 × 5 hr of data, we find a combined signal from carbon monoxide and water in absorption at a formal 5.9σ confidence level, indicating a non-inverted atmosphere. We derive a planet mass of M [subscript P] = (0.46 ± 0.02)M [subscript Jup] and an orbital inclination i between 79fdg6 and 82fdg2, with the upper limit set by the non-detection of the planet transit in previous photometric monitoring. However, there is no trace of the signal in the final five hours of data. A statistical analysis indicates that the signal from the first two nights is robust, but we find no compelling explanation for its absence in the final night. The latter suffers from stronger noise residuals and greater instrumental instability than the first two nights, but these cannot fully account for the missing signal. It is possible that the integrated dayside emission from 51 Peg b is instead strongly affected by weather. However, more data are required before we can claim any time variability in the planet's atmosphere. Netherlands Organization for Scientific Research (VICI grant No. 639.043.107) National Science Foundation (U.S.) (NSF grant No. 1108595) Netherlands Organization for Scientific Research (Rubicon fellowship) 2015-02-12T20:45:21Z 2015-02-12T20:45:21Z 2013-04 2012-12 Article http://purl.org/eprint/type/JournalArticle 0004-637X 1538-4357 http://hdl.handle.net/1721.1/94516 Brogi, M., I. A. G. Snellen, R. J. de Kok, S. Albrecht, J. L. Birkby, and E. J. W. de Mooij. “DETECTION OF MOLECULAR ABSORPTION IN THE DAYSIDE OF EXOPLANET 51 PEGASI B?” The Astrophysical Journal 767, no. 1 (March 21, 2013): 27. © 2013 American Astronomical Society. en_US http://dx.doi.org/10.1088/0004-637x/767/1/27 Astrophysical Journal Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf Institute of Physics/American Astronomical Society American Astronomical Society |
| spellingShingle | Brogi, M. Snellen, I. A. G. de Kok, R. J. Albrecht, Simon H. Birkby, J. L. de Mooij, E. J. W. DETECTION OF MOLECULAR ABSORPTION IN THE DAYSIDE OF EXOPLANET 51 PEGASI b? |
| title | DETECTION OF MOLECULAR ABSORPTION IN THE DAYSIDE OF EXOPLANET 51 PEGASI b? |
| title_full | DETECTION OF MOLECULAR ABSORPTION IN THE DAYSIDE OF EXOPLANET 51 PEGASI b? |
| title_fullStr | DETECTION OF MOLECULAR ABSORPTION IN THE DAYSIDE OF EXOPLANET 51 PEGASI b? |
| title_full_unstemmed | DETECTION OF MOLECULAR ABSORPTION IN THE DAYSIDE OF EXOPLANET 51 PEGASI b? |
| title_short | DETECTION OF MOLECULAR ABSORPTION IN THE DAYSIDE OF EXOPLANET 51 PEGASI b? |
| title_sort | detection of molecular absorption in the dayside of exoplanet 51 pegasi b |
| url | http://hdl.handle.net/1721.1/94516 |
| work_keys_str_mv | AT brogim detectionofmolecularabsorptioninthedaysideofexoplanet51pegasib AT snelleniag detectionofmolecularabsorptioninthedaysideofexoplanet51pegasib AT dekokrj detectionofmolecularabsorptioninthedaysideofexoplanet51pegasib AT albrechtsimonh detectionofmolecularabsorptioninthedaysideofexoplanet51pegasib AT birkbyjl detectionofmolecularabsorptioninthedaysideofexoplanet51pegasib AT demooijejw detectionofmolecularabsorptioninthedaysideofexoplanet51pegasib |