Microlensing Search for Planets with Two Simultaneously Rising Suns

Han, Cheongho

doi:10.1086/586896

Cited by 36 publications

(17 citation statements)

References 17 publications

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“…What is immediately noticeable from the animations is the fact that often the ABb system is well-approximated by a superposition of the AB and Ab systems, at least in parts of the caustic, as has been previously noted by Han (2008b) and similarly noted for multiplanet systems by Gaudi et al (1998) and Han et al (2001). In fact, the ABb caustics appear to largely follow the three topologies of double-lens planetary microlensing, though see Daněk & Heyrovský (2015a) for a more precise definition of the multiple possible topologies of triple lenses.…”

Section: Superposition Self-intersection and Metamorphosessupporting

confidence: 64%

“…4 To date, only one microlensing event has been claimed to be caused by a circumbinary planet, MACHO-97-BLG-41L (Bennett et al 1999), but this was later shown to be caused by binary stars with orbital motion (Albrow et al 2000;Jung et al 2013;Han et al 2016). There have been no other microlensing circumbinary planet detections published, and relatively little theoretical work on microlensing by circumbinary planets, with only a brief paper by Han (2008b) addressing them directly. By assuming that circumbinary planets would be most detectable when the size of the central caustics of the binary and planet were similar, Han (2008b) esti-mated the range of planet and binary separations for which the microlensing technique is efficient at detecting circumbinary planetary systems.…”

Section: Introductionmentioning

confidence: 99%

“…In Section 3 we consider the impact of the binary's orbital motion relative to the planet's on caustic motion. In Section 4 we build upon the Han (2008b) study and attempt to quantify the fraction of circumbinary planet events with caustic crossings that will be obviously recognizable as triple lenses. We end the paper with a brief discussion in Section 5 and conclusions in Section 6.…”

Section: Introductionmentioning

confidence: 99%

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Caustic Structures and Detectability of Circumbinary Planets in Microlensing

Luhn

Penny

Gaudi

2016

ApJ

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Recent discoveries of circumbinary planets in Kepler data show that there is a viable channel of planet formation around binary main sequence stars. Motivated by these discoveries, we have investigated the caustic structures and detectability of circumbinary planets in microlensing events. We have produced a suite of animations of caustics as a function of the projected separation and angle of the binary host to efficiently explore caustic structures over the entire circumbinary parameter space. Aided by these animations, we have derived a semi-empirical analytic expression for the location of planetary caustics, which are displaced in circumbinary lenses relative to those of planets with a single host. We have used this expression to show that the dominant source of caustic motion will be due to the planet's orbital motion and not that of the binary star. Finally, we estimate the fraction of circumbinary microlensing events that are recognizable as such to be significant (5-50 percent) for binary projected separations in the range 0.1-0.5 in units of Einstein radii.

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Section: Superposition Self-intersection and Metamorphosessupporting

confidence: 64%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Caustic Structures and Detectability of Circumbinary Planets in Microlensing

Luhn

Penny

Gaudi

2016

ApJ

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“…In particular, the microlensing technique should be able to identify circumstellar giant planets in binary systems 100 AU (Lee et al 2008), or Jupiter-mass circumbinary planets orbiting binaries separated by ∼0.15-0.5 AU (Han 2008). In the future, microlensing searches may thus enrich the samples of planets residing in and around (moderately) close binaries.…”

Section: Observational Methods To Detect Extrasolar Planets In Binarymentioning

confidence: 99%

Detection and Characterization of Planets in Binary and Multiple Systems

Eggenberger

2010

EAS Publications Series

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Abstract. Moderately close binaries are a special class of targets for planet searches. From a theoretical standpoint, their hospitality to giant planets is uncertain and debated. From an observational standpoint, many of these systems present technical difficulties for precise radial-velocity measurements and classical Doppler surveys avoid them accordingly. In spite of these adverse factors, present data support the idea that giant planets residing in binary and hierarchical systems provide unique observational constraints on the processes of planet formation and evolution. The interest and the importance of including various types of binary stars in extrasolar planet studies have thus grown over time and significant efforts have recently been put into: (i) searching for stellar companions to the known planet-host stars using direct imaging, and (ii) extending Doppler planet searches to spectroscopic and moderately close visual binaries. In this contribution we review the observational progresses made over the past years to detect and study extrasolar planets in binary systems, putting special emphasis on the two developments mentioned above.

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“…Lensing by a binary star with a planet has been explored less frequently Lee et al 2008;Han 2008a;Chung & Park 2010). In view of the two recently detected systems, this is bound to change.…”

Section: Introductionmentioning

confidence: 99%

Critical Curves and Caustics of Triple-Lens Models

Danek

Heyrovsky

2015

ApJ

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Among the 25 planetary systems detected up to now by gravitational microlensing, there are two cases of a star with two planets, and two cases of a binary star with a planet. Other, yet undetected types of triple lenses include triple stars or stars with a planet with a moon. The analysis and interpretation of such events is hindered by the lack of understanding of essential characteristics of triple lenses, such as their critical curves and caustics. We present here analytical and numerical methods for mapping the critical-curve topology and caustic cusp number in the parameter space of n-point-mass lenses. We apply the methods to the analysis of four symmetric triple-lens models, and obtain altogether 9 different critical-curve topologies and 32 caustic structures. While these results include various generic types, they represent just a subset of all possible triplelens critical curves and caustics. Using the analyzed models, we demonstrate interesting features of triple lenses that do not occur in two-point-mass lenses. We show an example of a lens that cannot be described by the Chang-Refsdal model in the wide limit. In the close limit we demonstrate unusual structures of primary and secondary caustic loops, and explain the conditions for their occurrence. In the planetary limit we find that the presence of a planet may lead to a whole sequence of additional caustic metamorphoses. We show that a pair of planets may change the structure of the primary caustic even when placed far from their resonant position at the Einstein radius.

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Microlensing Search for Planets with Two Simultaneously Rising Suns

Cited by 36 publications

References 17 publications

Caustic Structures and Detectability of Circumbinary Planets in Microlensing

Caustic Structures and Detectability of Circumbinary Planets in Microlensing

Detection and Characterization of Planets in Binary and Multiple Systems

Critical Curves and Caustics of Triple-Lens Models

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