dc.date.accessioned | 2020-04-01T18:08:57Z | |
dc.date.available | 2020-04-01T18:08:57Z | |
dc.date.created | 2019-09-24T11:23:40Z | |
dc.date.issued | 2019 | |
dc.identifier.citation | von Essen, Carolina Wedemeyer, Sven Sosa, M. S. Hjorth, M. Parkash, V. Freudenthal, J. Mallonn, M. Miculán, R. G. Zibecchi, L. Cellone, S. Torres, A. F. . Indications for transit-timing variations in the exo-Neptune HAT-P-26b. Astronomy and Astrophysics. 2019, 628 | |
dc.identifier.uri | http://hdl.handle.net/10852/74340 | |
dc.description.abstract | Upon its discovery, the low-density transiting Neptune HAT-P-26b showed a 2.1σ detection drift in its spectroscopic data, while photometric data showed a weak curvature in the timing residuals, the confirmation of which required further follow-up observations. To investigate this suspected variability, we observed 11 primary transits of HAT-P-26b between March, 2015, and July, 2018. For this, we used the 2.15 m Jorge Sahade Telescope placed in San Juan, Argentina, and the 1.2 m STELLA and the 2.5 m Nordic Optical Telescope, both located in the Canary Islands, Spain. To add to valuable information on the transmission spectrum of HAT-P-26b, we focused our observations in the R-band only. To contrast the observed timing variability with possible stellar activity, we carried out a photometric follow-up of the host star over three years. We carried out a global fit to the data and determined the individual mid-transit times focusing specifically on the light curves that showed complete transit coverage. Using bibliographic data corresponding to both ground and space-based facilities, plus our new characterized mid-transit times derived from parts-per-thousand precise photometry, we observed indications of transit timing variations in the system, with an amplitude of ~4 min and a periodicity of ~270 epochs. The photometric and spectroscopic follow-up observations of this system will be continued in order to rule out any aliasing effects caused by poor sampling and the long-term periodicity. | |
dc.language | EN | |
dc.title | Indications for transit-timing variations in the exo-Neptune HAT-P-26b | |
dc.type | Journal article | |
dc.creator.author | von Essen, Carolina | |
dc.creator.author | Wedemeyer, Sven | |
dc.creator.author | Sosa, M. S. | |
dc.creator.author | Hjorth, M. | |
dc.creator.author | Parkash, V. | |
dc.creator.author | Freudenthal, J. | |
dc.creator.author | Mallonn, M. | |
dc.creator.author | Miculán, R. G. | |
dc.creator.author | Zibecchi, L. | |
dc.creator.author | Cellone, S. | |
dc.creator.author | Torres, A. F. | |
cristin.unitcode | 185,15,3,40 | |
cristin.unitname | Rosseland senter for solfysikk | |
cristin.ispublished | true | |
cristin.fulltext | original | |
cristin.qualitycode | 2 | |
dc.identifier.cristin | 1728225 | |
dc.identifier.bibliographiccitation | info:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Astronomy and Astrophysics&rft.volume=628&rft.spage=&rft.date=2019 | |
dc.identifier.jtitle | Astronomy and Astrophysics | |
dc.identifier.volume | 628 | |
dc.identifier.pagecount | 8 | |
dc.identifier.doi | https://doi.org/10.1051/0004-6361/201731966 | |
dc.identifier.urn | URN:NBN:no-77446 | |
dc.type.document | Tidsskriftartikkel | |
dc.type.peerreviewed | Peer reviewed | |
dc.source.issn | 0004-6361 | |
dc.identifier.fulltext | Fulltext https://www.duo.uio.no/bitstream/handle/10852/74340/1/aa31966-17.pdf | |
dc.type.version | PublishedVersion | |
cristin.articleid | A116 | |
dc.relation.project | NFR/262622 | |