3 years ago

# Modeling synthetic spectra for transiting extrasolar giant planets: detectability of H$_2$S and PH$_3$ with JWST.

Dong Wang, Yamila Miguel, Jonathan Lunine

JWST

$s large aperture and wide wavelength coverage will enable it to collect the highest quality transit spectra observed so far. For exoplanetary atmospheres we expect to retrieve the abundance of the most abundant molecules, such as H$_2$O, CO, and CH$_4$. Other molecules, such as H$_2$S and PH$_3$, have been observed in Jupiter and Saturn but their chemistry and detectability in strongly irradiated planets is highly unknown. In this paper, we make the first effort to study their spectral features in solar composition atmospheres, and evaluate their detectability with JWST. We model the chemistry of phosphorus and sulfur in solar composition atmospheres. Our model includes the effect of vertical transport. Photochemistry effects are not included in our calculations. Using the abundance profiles, we model the JWST transmission and emission spectra for K=6.8 G-type star and for planets with cloud-free solar composition atmospheres. We find PH$_3$is detectable at 3 sigma from transmission spectra of the simulated atmosphere with$T_{\rm eq}$%CONTENT%lt;$ 500K using the NIRCam LW grism F444W mode with a total observing time of 28.8 hrs. H$_2$S is detectable at 3 sigma in the transmission and emission spectra for the simulated planet with $T_{\rm eq}$ %CONTENT%gt;$1500K using the NIRCam LW grism F322W2 mode with a total observing time of 24.0 hrs. Our results specifically highlight the importance of including H$_2$S for future abundances retrieval with JWST. The presence of clouds and hazes challenges the detections of PH$_3$and H$_2$S, but H$_2$S features are still expected to be present in the emission spectra. Publisher URL: http://arxiv.org/abs/1711.00191 DOI: arXiv:1711.00191v1 You might also like Never Miss Important Research Researcher is an app designed by academics, for academics. Create a personalised feed in two minutes. Choose from over 15,000 academics journals covering ten research areas then let Researcher deliver you papers tailored to your interests each day. Researcher displays publicly available abstracts and doesn’t host any full article content. If the content is open access, we will direct clicks from the abstracts to the publisher website and display the PDF copy on our platform. Clicks to view the full text will be directed to the publisher website, where only users with subscriptions or access through their institution are able to view the full article.$s large aperture and wide wavelength coverage will enable it to\ncollect the highest quality transit spectra observed so far. For exoplanetary\natmospheres we expect to retrieve the abundance of the most abundant molecules,\nsuch as H$_2$O, CO, and CH$_4$. Other molecules, such as H$_2$S and PH$_3$,\nhave been observed in Jupiter and Saturn but their chemistry and detectability\nin strongly irradiated planets is highly unknown. In this paper, we make the\nfirst effort to study their spectral features in solar composition atmospheres,\nand evaluate their detectability with JWST. We model the chemistry of\nphosphorus and sulfur in solar composition atmospheres. Our model includes the\neffect of vertical transport. Photochemistry effects are not included in our\ncalculations. Using the abundance profiles, we model the JWST transmission and\nemission spectra for K=6.8 G-type star and for planets with cloud-free solar\ncomposition atmospheres. We find PH$_3$ is detectable at 3 sigma from\ntransmission spectra of the simulated atmosphere with $T_{\\rm eq}$ %INITIAL_STATE%lt;$500K\nusing the NIRCam LW grism F444W mode with a total observing time of 28.8 hrs.\nH$_2$S is detectable at 3 sigma in the transmission and emission spectra for\nthe simulated planet with$T_{\\rm eq}$%INITIAL_STATE%gt;$ 1500K using the NIRCam LW grism\nF322W2 mode with a total observing time of 24.0 hrs. Our results specifically\nhighlight the importance of including H$_2$S for future abundances retrieval\nwith JWST. The presence of clouds and hazes challenges the detections of PH$_3$\nand H$_2$S, but H$_2$S features are still expected to be present in the\nemission spectra.\n

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3 years ago

# Modeling synthetic spectra for transiting extrasolar giant planets: detectability of H$_2$S and PH$_3$ with JWST.

Dong Wang, Yamila Miguel, Jonathan Lunine

JWST

$s large aperture and wide wavelength coverage will enable it to collect the highest quality transit spectra observed so far. For exoplanetary atmospheres we expect to retrieve the abundance of the most abundant molecules, such as H$_2$O, CO, and CH$_4$. Other molecules, such as H$_2$S and PH$_3$, have been observed in Jupiter and Saturn but their chemistry and detectability in strongly irradiated planets is highly unknown. In this paper, we make the first effort to study their spectral features in solar composition atmospheres, and evaluate their detectability with JWST. We model the chemistry of phosphorus and sulfur in solar composition atmospheres. Our model includes the effect of vertical transport. Photochemistry effects are not included in our calculations. Using the abundance profiles, we model the JWST transmission and emission spectra for K=6.8 G-type star and for planets with cloud-free solar composition atmospheres. We find PH$_3$is detectable at 3 sigma from transmission spectra of the simulated atmosphere with$T_{\rm eq}$%CONTENT%lt;$ 500K using the NIRCam LW grism F444W mode with a total observing time of 28.8 hrs. H$_2$S is detectable at 3 sigma in the transmission and emission spectra for the simulated planet with $T_{\rm eq}$ %CONTENT%gt;$1500K using the NIRCam LW grism F322W2 mode with a total observing time of 24.0 hrs. Our results specifically highlight the importance of including H$_2$S for future abundances retrieval with JWST. The presence of clouds and hazes challenges the detections of PH$_3$and H$_2$S, but H$_2\$S features are still expected to be present in the emission spectra.

Publisher URL: http://arxiv.org/abs/1711.00191

DOI: arXiv:1711.00191v1

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Researcher displays publicly available abstracts and doesn’t host any full article content. If the content is open access, we will direct clicks from the abstracts to the publisher website and display the PDF copy on our platform. Clicks to view the full text will be directed to the publisher website, where only users with subscriptions or access through their institution are able to view the full article.