Detection of the secondary eclipse of Qatar-1b in the Ks band
<p><em>Aims. </em>Qatar-1b is a close-orbiting hot Jupiter (<span class="simple-math"><em>R</em><sub>p</sub> ≃ 1.18 <em>R</em><sub>J</sub></span>, <span class="simple-m...
| Main Authors: | , , , , , , |
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| Format: | Journal article |
| Language: | English |
| Published: |
EDP Sciences
2016
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| _version_ | 1826261205615902720 |
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| author | Cruz, P Barrado, D Lillo-Box, J Diaz, M Birkby, J López-Morales, M Fortney, JJ |
| author_facet | Cruz, P Barrado, D Lillo-Box, J Diaz, M Birkby, J López-Morales, M Fortney, JJ |
| author_sort | Cruz, P |
| collection | OXFORD |
| description | <p><em>Aims. </em>Qatar-1b is a close-orbiting hot Jupiter (<span class="simple-math"><em>R</em><sub>p</sub> ≃ 1.18 <em>R</em><sub>J</sub></span>, <span class="simple-math"><em>M</em><sub>p</sub> ≃ 1.33 <em>M</em><sub>J</sub></span>) around a metal-rich K-dwarf, with orbital separation and period of 0.023 AU and 1.42 days. We have observed the secondary eclipse of this exoplanet in the <em>K</em>s band with the objective of deriving a brightness temperature for the planet and providing further constraints to the orbital configuration of the system.</p>
<p><em>Methods. </em>We obtained near-infrared photometric data from the ground by using the OMEGA2000 instrument at the 3.5 m telescope at Calar Alto (Spain) in staring mode, with the telescope defocused. We have used principal component analysis (PCA) to identify correlated systematic trends in the data. A Markov chain Monte Carlo analysis was performed to model the correlated systematics and fit for the secondary eclipse of Qatar-1b using a previously developed occultation model. We adopted the prayer bead method to assess the effect of red noise on the derived parameters.</p>
<p><em>Results. </em>We measured a secondary eclipse depth of <span class="simple-math">0.196%<sup>+ 0.071%</sup></span><span class="simple-math"><sub>−0.051%</sub></span>, which indicates a brightness temperature in the <em>K</em>s band for the planet of <span class="simple-math">1885<sup>+ 212</sup></span><span class="simple-math"><sub>-168</sub></span> K. We also measured a small deviation in the central phase of the secondary eclipse of <span class="simple-math">−0.0079<sup>+ 0.0162</sup></span><span class="simple-math"><sub>-0.0043</sub></span>, which leads to a value for <span class="simple-math"><em>e</em>cos<em>ω</em></span> of <span class="simple-math">−0.0123<sup>+ 0.0252</sup></span><span class="simple-math"><sub>-0.0067</sub></span>. However, this last result needs to be confirmed with more data.</p> |
| first_indexed | 2024-03-06T19:17:52Z |
| format | Journal article |
| id | oxford-uuid:19099687-c765-4448-aaf1-63346f0829e9 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T19:17:52Z |
| publishDate | 2016 |
| publisher | EDP Sciences |
| record_format | dspace |
| spelling | oxford-uuid:19099687-c765-4448-aaf1-63346f0829e92022-03-26T10:46:40ZDetection of the secondary eclipse of Qatar-1b in the Ks bandJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:19099687-c765-4448-aaf1-63346f0829e9EnglishSymplectic ElementsEDP Sciences2016Cruz, PBarrado, DLillo-Box, JDiaz, MBirkby, JLópez-Morales, MFortney, JJ<p><em>Aims. </em>Qatar-1b is a close-orbiting hot Jupiter (<span class="simple-math"><em>R</em><sub>p</sub> ≃ 1.18 <em>R</em><sub>J</sub></span>, <span class="simple-math"><em>M</em><sub>p</sub> ≃ 1.33 <em>M</em><sub>J</sub></span>) around a metal-rich K-dwarf, with orbital separation and period of 0.023 AU and 1.42 days. We have observed the secondary eclipse of this exoplanet in the <em>K</em>s band with the objective of deriving a brightness temperature for the planet and providing further constraints to the orbital configuration of the system.</p> <p><em>Methods. </em>We obtained near-infrared photometric data from the ground by using the OMEGA2000 instrument at the 3.5 m telescope at Calar Alto (Spain) in staring mode, with the telescope defocused. We have used principal component analysis (PCA) to identify correlated systematic trends in the data. A Markov chain Monte Carlo analysis was performed to model the correlated systematics and fit for the secondary eclipse of Qatar-1b using a previously developed occultation model. We adopted the prayer bead method to assess the effect of red noise on the derived parameters.</p> <p><em>Results. </em>We measured a secondary eclipse depth of <span class="simple-math">0.196%<sup>+ 0.071%</sup></span><span class="simple-math"><sub>−0.051%</sub></span>, which indicates a brightness temperature in the <em>K</em>s band for the planet of <span class="simple-math">1885<sup>+ 212</sup></span><span class="simple-math"><sub>-168</sub></span> K. We also measured a small deviation in the central phase of the secondary eclipse of <span class="simple-math">−0.0079<sup>+ 0.0162</sup></span><span class="simple-math"><sub>-0.0043</sub></span>, which leads to a value for <span class="simple-math"><em>e</em>cos<em>ω</em></span> of <span class="simple-math">−0.0123<sup>+ 0.0252</sup></span><span class="simple-math"><sub>-0.0067</sub></span>. However, this last result needs to be confirmed with more data.</p> |
| spellingShingle | Cruz, P Barrado, D Lillo-Box, J Diaz, M Birkby, J López-Morales, M Fortney, JJ Detection of the secondary eclipse of Qatar-1b in the Ks band |
| title | Detection of the secondary eclipse of Qatar-1b in the Ks band |
| title_full | Detection of the secondary eclipse of Qatar-1b in the Ks band |
| title_fullStr | Detection of the secondary eclipse of Qatar-1b in the Ks band |
| title_full_unstemmed | Detection of the secondary eclipse of Qatar-1b in the Ks band |
| title_short | Detection of the secondary eclipse of Qatar-1b in the Ks band |
| title_sort | detection of the secondary eclipse of qatar 1b in the ks band |
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