Dusty tails of evaporating exoplanets

Lieshout, R. Van; Min, M.; Dominik, C.; Brogi, Matteo; Graaff, Thomas de; Hekker, S.; Kama, M.; Keller, Christoph U.; Ridden-Harper, Andrew; Werkhoven, T. I. M. van

doi:10.1051/0004-6361/201629250

Cited by 34 publications

(33 citation statements)

References 64 publications

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“…According to van Lieshout et al (2014), the comet-like tail of KOI 2700b may consist of dust grains composed of corundum (α-Al 2 O 3 ) or iron-rich silicate minerals. Therefore during the modeling we applied selected species, which have similar chemical composition: γ-alumina, enstatite, forsterite, olivine (with 50% magnesium and 50% iron) and pyroxene (with 40% magnesium and 60% iron).…”

Section: Calculation Of the Optical Properties Of The Dustmentioning

confidence: 99%

“…The evaporation time scale of grains in the tail can be calculated using the equations and tables presented by van Lieshout et al (2014). First, we can approximate the equilibrium vapor pressure as…”

Section: Mass-loss Rate From the Planetmentioning

confidence: 99%

“…The values of T eqv can be interpolated from the tables of Budaj et al (2015), and the values of A, B are tabulated for some species in van Lieshout et al (2014). Subsequently, we can approximate the mass-loss flux from the surface of the dust grain J [g.cm…”

Section: Mass-loss Rate From the Planetmentioning

confidence: 99%

“…The values of α and µ are also tabulated for some species in van Lieshout et al (2014). Finally, we can calculate the evaporation time scale of grains in the tail as:…”

Section: Mass-loss Rate From the Planetmentioning

confidence: 99%

“…The values of ρ d are tabulated for some species in van Lieshout et al (2014) or in Budaj et al (2015). Using Eqs.…”

Section: Mass-loss Rate From the Planetmentioning

confidence: 99%

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Light-curve analysis of KOI 2700b: the second extrasolar planet with a comet-like tail

Garai

2018

A&A

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Context. The Kepler object KOI 2700b (KIC 8639908b) was discovered recently as the second exoplanet with a comet-like tail. It exhibits a distinctly asymmetric transit profile, likely indicative of the emission of dusty effluents and reminiscent of KIC 12557548b, the first exoplanet with a comet-like tail. Aims. The scientific goal of this work is to verify the disintegrating-planet scenario of KOI 2700b by modeling its light curve and to put constraints on various tail and planet properties, as was done in the case of KIC 12557548b. Methods. We obtained the phase-folded and binned transit light curve of KOI 2700b, which we subsequently iteratively modeled using the radiative-transfer code SHELLSPEC. We modeled the comet-like tail as part of a ring around the parent star and we also included the solid body of the planet in the model. During the modeling we applied selected species and dust particle sizes. Results. We confirmed the disintegrating-planet scenario of KOI 2700b. Furthermore, via modeling, we derived some interesting features of KOI 2700b and its comet-like tail. It turns out that the orbital plane of the planet and its tail are not edge-on, but the orbital inclination angle is from the interval [85.1, 88.6] deg. In comparison with KIC 12557548b, KOI 2700b exhibits a relatively low dust density decreasing in its tail. We also derived the dust density at the beginning of the ring and the highest optical depth through the tail in front of the star, based on a tail-model with a cross-section of 0.05 × 0.05R ⊙ at the beginning and 0.09 × 0.09R ⊙ at its end. Our results show that the dimension of the planet is R p /R s ≤ 0.014 (R p ≤ 0.871R ⊕ , or ≤ 5551 km). We also estimated the mass-loss rate from KOI 2700b, and we obtainedṀ values from the interval [5.05 × 10 7 , 4.41 × 10 15 ] g.s −1 . On the other hand, we could not draw any satisfactory conclusions about the typical grain size in the dust tail.

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Section: Calculation Of the Optical Properties Of The Dustmentioning

confidence: 99%

Section: Mass-loss Rate From the Planetmentioning

confidence: 99%

Section: Mass-loss Rate From the Planetmentioning

confidence: 99%

“…The values of α and µ are also tabulated for some species in van Lieshout et al (2014). Finally, we can calculate the evaporation time scale of grains in the tail as:…”

Section: Mass-loss Rate From the Planetmentioning

confidence: 99%

“…The values of ρ d are tabulated for some species in van Lieshout et al (2014) or in Budaj et al (2015). Using Eqs.…”

Section: Mass-loss Rate From the Planetmentioning

confidence: 99%

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