TY - JOUR
T1 - A comprehensive reanalysis of Spitzer's 4.5 μm phase curves, and the phase variations of the ultra-hot Jupiters MASCARA-1b and KELT-16b
AU - Bell, Taylor J.
AU - Dang, Lisa
AU - Cowan, Nicolas B.
AU - Bean, Jacob
AU - Désert, Jean Michel
AU - Fortney, Jonathan J.
AU - Keating, Dylan
AU - Kempton, Eliza
AU - Kreidberg, Laura
AU - Line, Michael R.
AU - Mansfield, Megan
AU - Parmentier, Vivien
AU - Stevenson, Kevin B.
AU - Swain, Mark
AU - Zellem, Robert T.
N1 - Publisher Copyright:
© 2021 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society.
PY - 2021/7/1
Y1 - 2021/7/1
N2 - We have developed an open-source pipeline for the analysis of Spitzer/IRAC channel 1 and 2 time-series photometry, incorporating some of the most popular decorrelation methods. We applied this pipeline to new phase curve observations of ultra-hot Jupiters MASCARA-1b and KELT-16b, and we performed the first comprehensive reanalysis of 15 phase curves. We find that MASCARA-1b and KELT-16b have phase offsets of W and W, dayside temperatures of and K, and nightside temperatures of 1900{+430}K, respectively. We confirm a strong correlation between dayside and irradiation temperatures with a shallower dependence for nightside temperature. We also find evidence that the normalized phase curve amplitude (peak-to-trough divided by eclipse depth) is correlated with stellar effective temperature. In addition, while our different models often retrieve similar parameters, significant differences occasionally arise between them, as well as between our preferred model and the literature values. Nevertheless, our preferred models are consistent with published phase offsets to within -8 ± 21 degrees (-1.6 ± 3.2 sigma), and normalized phase curve amplitudes are on average reproduced to within -0.01 ± 0.24 (-0.1 ± 1.6 sigma). Finally, we find that BLISS performs best in most cases, but not all; we therefore recommend future analyses consider numerous detector models to ensure an optimal fit and to assess model dependencies.
AB - We have developed an open-source pipeline for the analysis of Spitzer/IRAC channel 1 and 2 time-series photometry, incorporating some of the most popular decorrelation methods. We applied this pipeline to new phase curve observations of ultra-hot Jupiters MASCARA-1b and KELT-16b, and we performed the first comprehensive reanalysis of 15 phase curves. We find that MASCARA-1b and KELT-16b have phase offsets of W and W, dayside temperatures of and K, and nightside temperatures of 1900{+430}K, respectively. We confirm a strong correlation between dayside and irradiation temperatures with a shallower dependence for nightside temperature. We also find evidence that the normalized phase curve amplitude (peak-to-trough divided by eclipse depth) is correlated with stellar effective temperature. In addition, while our different models often retrieve similar parameters, significant differences occasionally arise between them, as well as between our preferred model and the literature values. Nevertheless, our preferred models are consistent with published phase offsets to within -8 ± 21 degrees (-1.6 ± 3.2 sigma), and normalized phase curve amplitudes are on average reproduced to within -0.01 ± 0.24 (-0.1 ± 1.6 sigma). Finally, we find that BLISS performs best in most cases, but not all; we therefore recommend future analyses consider numerous detector models to ensure an optimal fit and to assess model dependencies.
KW - planets and satellites: individual (KELT-16b)
KW - planets and satellites: individual (MASCARA-1b)
KW - techniques: photometric
UR - http://www.scopus.com/inward/record.url?scp=85107276353&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85107276353&partnerID=8YFLogxK
U2 - 10.1093/mnras/stab1027
DO - 10.1093/mnras/stab1027
M3 - Article
AN - SCOPUS:85107276353
SN - 0035-8711
VL - 504
SP - 3316
EP - 3337
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 3
ER -