Colorado Ultraviolet Transit Experiment Near-Ultraviolet Transmission Spectroscopy of the Ultra-hot Jupiter KELT-9b
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| Auteurs principaux: | , , , , , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866910533933858816 |
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| author | Egan, Arika France, Kevin Sreejith, Aickara Gopinathan Fossati, Luca Koskinen, Tommi Fleming, Brian Nell, Nicholas Suresh, Ambily Cauley, P. Wilson Desert, Jean-Michele Petit, Pascal Vidotto, Aline A. |
| author_facet | Egan, Arika France, Kevin Sreejith, Aickara Gopinathan Fossati, Luca Koskinen, Tommi Fleming, Brian Nell, Nicholas Suresh, Ambily Cauley, P. Wilson Desert, Jean-Michele Petit, Pascal Vidotto, Aline A. |
| contents | We present new near-ultraviolet (NUV, $λ$ = 2479 $-$ 3306 $Å$) transmission spectroscopy of KELT-9b, the hottest known exoplanet, obtained with the Colorado Ultraviolet Transit Experiment ($CUTE$) CubeSat. Two transits were observed on September 28th and September 29th 2022, referred to as Visits 1 and 2 respectively. Using a combined transit and systematics model for each visit, the best-fit broadband NUV light curves are R$_{\text{p}}$/R$_{\star}$ $=$ 0.136$_{0.0146}^{0.0125}$ for Visit 1 and R$_{\text{p}}$/R$_{\star}$ $=$ 0.111$_{0.0190}^{0.0162}$ for Visit 2, appearing an average of 1.54$\times$ larger in the NUV than at optical wavelengths. While the systematics between the two visits vary considerably, the two broadband NUV light curves are consistent with each other. A transmission spectrum with 25 $Å$ bins suggests a general trend of excess absorption in the NUV, consistent with expectations for ultra-hot Jupiters. Although we see an extended atmosphere in the NUV, the reduced data lack the sensitivity to probe individual spectral lines. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_13656 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Colorado Ultraviolet Transit Experiment Near-Ultraviolet Transmission Spectroscopy of the Ultra-hot Jupiter KELT-9b Egan, Arika France, Kevin Sreejith, Aickara Gopinathan Fossati, Luca Koskinen, Tommi Fleming, Brian Nell, Nicholas Suresh, Ambily Cauley, P. Wilson Desert, Jean-Michele Petit, Pascal Vidotto, Aline A. Earth and Planetary Astrophysics We present new near-ultraviolet (NUV, $λ$ = 2479 $-$ 3306 $Å$) transmission spectroscopy of KELT-9b, the hottest known exoplanet, obtained with the Colorado Ultraviolet Transit Experiment ($CUTE$) CubeSat. Two transits were observed on September 28th and September 29th 2022, referred to as Visits 1 and 2 respectively. Using a combined transit and systematics model for each visit, the best-fit broadband NUV light curves are R$_{\text{p}}$/R$_{\star}$ $=$ 0.136$_{0.0146}^{0.0125}$ for Visit 1 and R$_{\text{p}}$/R$_{\star}$ $=$ 0.111$_{0.0190}^{0.0162}$ for Visit 2, appearing an average of 1.54$\times$ larger in the NUV than at optical wavelengths. While the systematics between the two visits vary considerably, the two broadband NUV light curves are consistent with each other. A transmission spectrum with 25 $Å$ bins suggests a general trend of excess absorption in the NUV, consistent with expectations for ultra-hot Jupiters. Although we see an extended atmosphere in the NUV, the reduced data lack the sensitivity to probe individual spectral lines. |
| title | Colorado Ultraviolet Transit Experiment Near-Ultraviolet Transmission Spectroscopy of the Ultra-hot Jupiter KELT-9b |
| topic | Earth and Planetary Astrophysics |
| url | https://arxiv.org/abs/2407.13656 |