Astroimagej: Image Processing and Photometric Extraction for Ultra-Precise Astronomical Light Curves

Collins, Karen A.; Kielkopf, John F.; Stassun, Keivan G.; Hessman, F. V.

doi:10.3847/1538-3881/153/2/77

Cited by 592 publications

(465 citation statements)

References 32 publications

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“…-(1) Our Study; (2) Maciejewski et al (2013); (3) a The near-UV R p /R * of WASP-77Ab is corrected for the dilution of the companion stars (Section 5.15). Kielkopf & Stassun 2015;Croll et al 2015;Kreidberg et al 2015). WASP-12 is a triple star system with a binary M dwarf system in orbit around the G0 star (Crossfield et al 2012;Bergfors et al 2013;Bechter et al 2014).…”

Section: Wasp-12bmentioning

confidence: 99%

Ground-based near-UV observations of 15 transiting exoplanets: constraints on their atmospheres and no evidence for asymmetrical transits

Turner

Pearson

Biddle

et al. 2016

Mon. Not. R. Astron. Soc.

101

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Transits of exoplanets observed in the near-UV have been used to study the scattering properties of their atmospheres and possible star-planet interactions. We observed the primary transits of 15 exoplanets (CoRoT-1b, GJ436b, HAT-P-1b, HAT-P-13b, HAT-P-16b, HAT-P-22b, TrES2b, in the near-UV and several optical photometric bands to update their planetary parameters, ephemerides, search for a wavelength dependence in their transit depths to constrain their atmospheres, and determine if asymmetries are visible in their light curves. Here, we present the first ground-based near-UV light curves for 12 of the targets (CoRoT1b, GJ436b, HAT-P-1b, HAT-P-13b, HAT-P-22b, TrES-2b, TrES-4b, WASP-1b, WASP-33b, WASP-36b, WASP-48b, and WASP-77Ab). We find that none of the near-UV transits exhibit any non-spherical asymmetries, this result is consistent with recent theoretical predictions by Ben-Jaffel et al. and Turner et al. The multiwavelength photometry indicates a constant transit depth from near-UV to optical wavelengths in 10 targets (suggestive of clouds), and a varying transit depth with wavelength in 5 targets (hinting at Rayleigh or aerosol scattering in their atmospheres). We also present the first detection of a smaller near-UV transit depth than that measured in the optical in WASP-1b and a possible opacity source that can cause such radius variations is currently unknown. WASP-36b also exhibits a smaller near-UV transit depth at

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Section: Wasp-12bmentioning

confidence: 99%

Ground-based near-UV observations of 15 transiting exoplanets: constraints on their atmospheres and no evidence for asymmetrical transits

Turner

Pearson

Biddle

et al. 2016

Mon. Not. R. Astron. Soc.

101

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“…the LCOGT BANZAI pipeline, which performs bad pixel masking, bias and dark subtraction, flat-field correction, and provides an astrometric solution. We performed differential photometry from the reduced images with AstroImageJ (Collins et al 2016), using 2MASS J16234525-1722086 and 2MASS J16230556-1716209 as comparison stars. The color of RIK-210 in these bands is -¢ V i =1.77±0.17 mag (uncorrected for reddening, from APASS DR9).…”

Section: Archival and Follow-up Photometric Monitoringmentioning

confidence: 99%

A Transient Transit Signature Associated with the Young Star RIK-210

David

Petigura

Hillenbrand

et al. 2017

ApJ

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We find transienttransit-like dimming events within the K2 time series photometry of the young star RIK-210 in the Upper Scorpius OB association. These dimming events are variable in depth, duration, and morphology. High spatial resolution imaging revealed thatthe star is singleand radial velocity monitoring indicated that the dimming events cannot be due to an eclipsing stellar or brown dwarf companion. Archival and follow-up photometry suggest the dimming events are transient in nature. The variable morphology of the dimming events suggests they are not due to a singlespherical body. The ingress of each dimming event is always shallower than egress, as one would expect for an orbiting body with a leading tail. The dimming events are periodic and synchronous with the stellar rotation. However, we argue it is unlikely the dimming events could be attributed to anything on the stellar surface based on the observed depths and durations. Variable obscuration by a protoplanetary disk is unlikely on the basis that the star is not actively accreting and lacks the infrared excess associated with an inner disk. Rather, we explore the possibilities that the dimming events are due to magnetospheric clouds, a transiting protoplanet surrounded by circumplanetary dust and debris, eccentric orbiting bodies undergoing periodic tidal disruption, or an extended field of dust or debris near the corotation radius.

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“…We used the TAPIR software package (Jensen 2013) to predict transit events, and we obtained 9 full or partial transits in multiple bands between 2015 January and 2016 February. All data were calibrated and processed using the AstroImageJ package (AIJ) 1 (Collins & Kielkopf 2013;Collins et al 2016) unless otherwise stated. The follow-up light curves are displayed in Figure 2, and Table 3 lists the details of the observations.…”

Section: Photometric Follow-upmentioning

confidence: 99%

KELT-11b: A Highly Inflated Sub-Saturn Exoplanet Transiting the V = 8 Subgiant HD 93396

Pepper

Rodriguez

Collins

et al. 2017

Self Cite

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We report the discovery of a transiting exoplanet, KELT-11b, orbiting the bright (V = 8.0) subgiant HD 93396. A global analysis of the system shows that the host star is an evolved subgiant star with T eff = 5370±51 K, M * = 1.438−0.046 , and [Fe/H]= 0.180 ± 0.075. The planet is a low-mass gas giant in a P = 4.736529 ± 0.00006 day orbit, with M P = 0.195 ± 0.018 M J , R P = 1.37, surface gravity log g P = 2.407−0.086 , and equilibrium temperature T eq = 1712 +51 −46 K. KELT-11 is the brightest known transiting exoplanet host in the southern hemisphere by more than a magnitude, and is the 6th brightest transit host to date. The planet is one of the most inflated planets known, with an exceptionally large atmospheric scale height (2763 km), and an associated size of the expected atmospheric transmission signal of 5.6%. These attributes make the KELT-11 system a valuable target for follow-up and atmospheric characterization, and it promises to become one of the benchmark systems for the study of inflated exoplanets.

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Astroimagej: Image Processing and Photometric Extraction for Ultra-Precise Astronomical Light Curves

Cited by 592 publications

References 32 publications

Ground-based near-UV observations of 15 transiting exoplanets: constraints on their atmospheres and no evidence for asymmetrical transits

Ground-based near-UV observations of 15 transiting exoplanets: constraints on their atmospheres and no evidence for asymmetrical transits

A Transient Transit Signature Associated with the Young Star RIK-210

KELT-11b: A Highly Inflated Sub-Saturn Exoplanet Transiting the V = 8 Subgiant HD 93396

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