The interaction of an O star wind with a Herbig-Haro jet

Esquivel, A.; Raga, A. C.; Cantó, J.; Rodríguez-González, A.

doi:10.1051/0004-6361/200912825

Cited by 31 publications

(17 citation statements)

References 16 publications

(24 reference statements)

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“…We adapted the radiationhydrodynamics/magnetohydrodynamics code guacho (Esquivel et al 2009;Esquivel & Raga 2013;Villarreal D'Angelo et al 2018) to simulate the interaction between the stellar wind and the photoionizing flux, with the escaping planetary atmosphere of a hot-Jupiter around a solar type star (i.e. the HD 209458 system).…”

Section: The Modelmentioning

confidence: 99%

Hydrodynamical interaction of stellar and planetary winds: effects of charge exchange and radiation pressure on the observed Ly α absorption

Esquivel

Schneiter

D’Angelo

et al. 2019

Monthly Notices of the Royal Astronomical Society

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Lyman α observations of the transiting exoplanet HD 209458b enable the study of exoplanets exospheres exposed to stellar EUV fluxes, as well as the interacting stellar wind properties. In this study we present 3D hydrodynamical models for the stellarplanetary wind interaction including radiation pressure and charge exchange, together with photoionization, recombination and collisional ionization processes. Our models explore the contribution of the radiation pressure and charge exchange on the Lyα absorption profile in a hydrodynamical framework, and for a single set of stellar wind parameters appropriate for HD 209458. We find that most of the absorption is produced by the material from the planet, with a secondary contribution of neutralized stellar ions by charge exchange. At the same time, the hydrodynamic shock heats up the planetary material, resulting in a broad thermal profile. Meanwhile, the radiation pressure yielded a small velocity shift of the absorbing material. While neither charge exchange nor radiation pressure provide enough neutrals at the velocity needed to explain the observations at −100 km s −1 individually, we find that the two effects combined with the broad thermal profile are able to explain the observations.

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Section: The Modelmentioning

confidence: 99%

Hydrodynamical interaction of stellar and planetary winds: effects of charge exchange and radiation pressure on the observed Ly α absorption

Esquivel

Schneiter

D’Angelo

et al. 2019

Monthly Notices of the Royal Astronomical Society

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“…We used the radiation-hydrodynamics code guacho (Esquivel et al 2009;Esquivel & Raga 2013) to produce synthetic Ly-α absorption maps of a hot-Jupiter around a solar type star (i.e. the HD 209458 system).…”

Section: The Modelmentioning

confidence: 99%

Photoionization of planetary winds: case study HD 209458b

Schneiter

Esquivel

D’Angelo

et al. 2016

Mon. Not. R. Astron. Soc.

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Close-in hot Jupiters are exposed to a tremendous photon flux that ionizes the neutral escaping material from the planet leaving an observable imprint that makes them an interesting laboratory for testing theoretical models. In this work we present 3D hydrodynamic simulations with radiation transfer calculations of a close-in exoplanet in a blow-off state. We calculate the Ly-α absorption and compare it with observations of HD 209458b and previous simplified model results. Our results show that the hydrodynamic interaction together with a proper calculation of the photoionization proccess are able to reproduce the main features of the observed Ly-α absorption, in particular at the blue-shifted wings of the line. We found that the ionizing stellar flux produce an almost linear effect on the amount of absorption in the wake. Varying the planetary mass loss rate and the radiation flux, we were able to reproduce the 10% absorption observed at −100 km s −1 .

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“…We performed 3D simulations using the Guacho 1 code (Esquivel et al 2009;Esquivel & Raga 2013). The Guacho code uses a Cartesian grid to solve the near-conservation laws governing the gas-dynamics and the neutral hydrogen rate.…”

Section: Governing Equationsmentioning

confidence: 99%

Numerical models for the dust in RCW 120

Rodríguez-González

Méliani

Sánchez-Cruces

et al. 2019

A&A

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Context. The interstellar bubble RCW 120 seen around a type O runaway star is driven by the stellar wind and the ionising radiation emitted by the star. The boundary between the stellar wind and interstellar medium (ISM) is associated with the arc-shaped midinfrared dust emission around the star within the HII region. Aims. We aim to investigate the arc-shaped bow shock in RCW 120 by means of numerical simulations, including the radiation, dust, HII region, and wind bubble. Methods. We performed 3D radiation-hydrodynamic simulations including dust using the guacho code. Our model includes a detailed treatment of dust grains in the ISM and takes into account the drag forces between dust and gas and the effect of radiation pressure on the gas and dust. The dust is treated as a pressureless gas component. The simulation uses typical properties of RCW 120. We analyse five simulations to deduce the effect of the ionising radiation and dust on both the emission intensity and the shape of the shock. Results. The interaction of the wind and the ionising radiation from a runaway star with the ISM forms an arc-shaped bow shock where the dust from the ISM accumulates in front of the moving star. Moreover, the dust forms a second small arc-shaped structure within the rarefied region at the back of the star inside the bubble. In order to obtain the decoupling between the gas and the dust, it is necessary to include the radiation-hydrodynamic equations together with the dust and the stellar motion. In this work all these elements are considered together, and we show that the decoupling between gas and dust obtained in the simulation is in agreement with the morphology of the infrared observations of RCW 120.

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The interaction of an O star wind with a Herbig-Haro jet

Cited by 31 publications

References 16 publications

Hydrodynamical interaction of stellar and planetary winds: effects of charge exchange and radiation pressure on the observed Ly α absorption

Hydrodynamical interaction of stellar and planetary winds: effects of charge exchange and radiation pressure on the observed Ly α absorption

Photoionization of planetary winds: case study HD 209458b

Numerical models for the dust in RCW 120

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