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However, we lack a detailed understanding of this process because very few exoplanets that have been discovered to date could be probed for signatures of atmospheric escape. Recently, the metastable helium triplet at 1.083 <jats:italic>\u03bc<\/jats:italic>m has been shown to be a viable window for the presence of He-rich escaping envelopes around short-period exoplanets. Our objective is to use, for the first time, the Phoenix spectrograph to search for helium in the upper atmosphere of the inflated hot Jupiter WASP-127 b. We observed one transit and reduced the data manually since no pipeline is available. We did not find a significant in-transit absorption signal indicative of the presence of helium around WASP-127 b, and we set a 90% confidence upper limit for excess absorption at 0.87% in a 0.75 \u212b passband covering the He triplet. Given the large scale height of this planet, the lack of a detectable feature is likely due to unfavorable photoionization conditions for populating the metastable He\u202f<jats:sc>I<\/jats:sc> triplet. This conclusion is supported by the inferred low coronal and chromospheric activity of the host star and the old age of the system, which result in a relatively mild high-energy environment around the planet.<\/jats:p>","DOI":"10.1051\/0004-6361\/202038802","type":"journal-article","created":{"date-parts":[[2020,7,17]],"date-time":"2020-07-17T08:07:46Z","timestamp":1594973266000},"page":"A29","source":"Crossref","is-referenced-by-count":30,"title":["Search for helium in the upper atmosphere of the hot Jupiter WASP-127 b using Gemini\/Phoenix"],"prefix":"10.1051","volume":"640","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2248-3838","authenticated-orcid":false,"given":"Leonardo A.","family":"dos Santos","sequence":"first","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9704-5405","authenticated-orcid":false,"given":"David","family":"Ehrenreich","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9148-034X","authenticated-orcid":false,"given":"Vincent","family":"Bourrier","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1199-9759","authenticated-orcid":false,"given":"Romain","family":"Allart","sequence":"additional","affiliation":[]},{"given":"George","family":"King","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9699-1459","authenticated-orcid":false,"given":"Monika","family":"Lendl","sequence":"additional","affiliation":[]},{"given":"Christophe","family":"Lovis","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8205-9441","authenticated-orcid":false,"given":"Steve","family":"Margheim","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4933-2239","authenticated-orcid":false,"given":"Jorge","family":"Mel\u00e9ndez","sequence":"additional","affiliation":[]},{"given":"Julia V.","family":"Seidel","sequence":"additional","affiliation":[]},{"given":"S\u00e9rgio G.","family":"Sousa","sequence":"additional","affiliation":[]}],"member":"250","published-online":{"date-parts":[[2020,8,5]]},"reference":[{"key":"R1","doi-asserted-by":"crossref","first-page":"1384","DOI":"10.1126\/science.aat5879","volume":"362","author":"Allart","year":"2018","journal-title":"Science"},{"key":"R2","doi-asserted-by":"crossref","first-page":"A58","DOI":"10.1051\/0004-6361\/201834917","volume":"623","author":"Allart","year":"2019","journal-title":"A&A"},{"key":"R3","doi-asserted-by":"crossref","first-page":"A110","DOI":"10.1051\/0004-6361\/201935979","volume":"629","author":"Alonso-Floriano","year":"2019","journal-title":"A&A"},{"key":"R4","doi-asserted-by":"crossref","first-page":"A33","DOI":"10.1051\/0004-6361\/201322068","volume":"558","author":"Robitaille","year":"2013","journal-title":"A&A"},{"key":"R5","doi-asserted-by":"crossref","first-page":"A52","DOI":"10.1051\/0004-6361\/201221014","volume":"553","author":"Ben-Jaffel","year":"2013","journal-title":"A&A"},{"key":"R6","doi-asserted-by":"crossref","first-page":"A147","DOI":"10.1051\/0004-6361\/201833675","volume":"620","author":"Bourrier","year":"2018","journal-title":"A&A"},{"key":"R7","doi-asserted-by":"crossref","first-page":"A145","DOI":"10.1051\/0004-6361\/201833033","volume":"616","author":"Chen","year":"2018","journal-title":"A&A"},{"key":"R8","doi-asserted-by":"crossref","first-page":"459","DOI":"10.1038\/nature14501","volume":"522","author":"Ehrenreich","year":"2015","journal-title":"Nature"},{"key":"R9","first-page":"476","volume":"9147","author":"Follert","year":"2014","journal-title":"SPIE"},{"key":"R10","doi-asserted-by":"crossref","first-page":"650","DOI":"10.1093\/mnras\/staa918","volume":"495","author":"Gaidos","year":"2020","journal-title":"MNRAS"},{"key":"R11","doi-asserted-by":"crossref","first-page":"79","DOI":"10.1088\/0004-637X\/760\/1\/79","volume":"760","author":"Haswell","year":"2012","journal-title":"ApJ"},{"key":"R12","doi-asserted-by":"crossref","first-page":"353","DOI":"10.1117\/12.457666","volume":"4834","author":"Hinkle","year":"2003","journal-title":"Proc. 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