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The results from a single-dish molecular line survey of a set of 18 deeply embedded young stellar objects are summarized. More than 40 lines from 16 different species were observed with the JCMT, Onsala, IRAM 30m and SEST telescopes. The…

The dusty winds of cool evolved stars are a major contributor of the newly synthesised material enriching the Galaxy and future generations of stars. However, the details of the physics and chemistry behind dust formation and wind launching…

Future direct-imaging exoplanet missions such as WFIRST/AFTA, Exo-C, and Exo-S will measure the reflectivity of exoplanets at visible wavelengths. The exoplanets to be observed will be located further away from their parent stars than is…

地球与行星天体物理 · 物理学 2014-12-25 Renyu Hu

OH airglow is an important nocturnal emission of the Earth's mesopause region. As it is chemiluminescent radiation in a thin medium, the population distribution over the various roto-vibrational OH energy levels of the electronic ground…

大气与海洋物理 · 物理学 2020-05-18 Stefan Noll , Holger Winkler , Oleg Goussev , Bastian Proxauf

Photoabsorption of atomic oxygen in the energy region below the $\rm 1s^{-1}$ threshold in x-ray spectroscopy from {\it Chandra} and {\it XMM-Newton} is observed in a variety of x-ray binary spectra. Photoabsorption cross sections…

高能天体物理现象 · 物理学 2015-06-16 B. M. McLaughlin , C. P. Ballance , K. P. Bowen , D. J. Gardenghi , W. C. Stolte

Computing and using opacities is a key part of modeling and interpreting data of exoplanetary atmospheres. Since the underlying spectroscopic line lists are constantly expanding and currently include up to ~ 10^10 - 10^11 transition lines,…

Since the discovery of the first extrasolar planet more than twenty years ago, we have discovered nearly four thousand planets orbiting stars other than the Sun. Current observational instruments (on board the Hubble Space Telescope,…

地球与行星天体物理 · 物理学 2018-07-18 Olivia Venot , Benjamin Drummond , Yamila Miguel , Ingo P. Waldmann , Enzo Pascale , Tiziano Zingales

The Ariel Space Mission aims to observe a diverse sample of exoplanet atmospheres across a wide wavelength range of 0.5 to 7.8 microns. The observations are organized into four Tiers, with Tier 1 being a reconnaissance survey. This Tier is…

地球与行星天体物理 · 物理学 2023-09-14 Andrea Bocchieri , Lorenzo V. Mugnai , Enzo Pascale , Quentin Changeat , Giovanna Tinetti

To trace the source of the unique 13, 19.5, and 28 $\mu$m emission features in the spectra of oxygen-rich circumstellar shells around AGB stars, we have compared dust extinction spectra obtained by aerosol measurements. We have measured the…

天体物理仪器与方法 · 物理学 2015-05-13 A. Tamanai , H. Mutschke , J. Blum , Th. Posch , C. Koike , J. W. Ferguson

A new, complete, theoretical rotational and vibrational line list for the A-X electronic transition in MgH is presented. The list includes transition energies and oscillator strengths for all possible allowed transitions and was computed…

天体物理学 · 物理学 2016-08-30 P. F. Weck , A. Schweitzer , P. C. Stancil , P. H. Hauschildt , K. Kirby

We obtained over 90 hours of spectroscopic observations of four exoplanetary systems with the Hobby-Eberly Telescope (HET). Observations were taken in transit and out of transit, and we analyzed the differenced spectra---i.e., the…

地球与行星天体物理 · 物理学 2015-05-30 Adam G. Jensen , Seth Redfield , Michael Endl , William D. Cochran , Lars Koesterke , Travis S. Barman

In anticipation of future flagship missions focused on the goal of achieving direct imaging of rocky exoplanets, we have developed a database of models to help the community examine the potential spectral characteristics of a broad range of…

地球与行星天体物理 · 物理学 2020-10-21 Adam J. R. W. Smith , Avi M Mandell , Geronimo L Villanueva , Michael Dane Moore

A space telescope capable of high-contrast imaging has been recognized as the avenue toward finding terrestrial planets around nearby Sun-like stars and characterizing their potential habitability. It is thus essential to quantify the…

地球与行星天体物理 · 物理学 2022-06-01 Mario Damiano , Renyu Hu

With a temperature akin to an M-dwarf, WASP-33b is among the hottest Jupiters known, making it an ideal target for high-resolution optical spectroscopy. By analyzing both transmission and emission spectra, we aim to substantiate previous…

地球与行星天体物理 · 物理学 2020-08-12 Miranda K. Herman , Ernst J. W. de Mooij , Ray Jayawardhana , Matteo Brogi

ExoCross is a Fortran code for generating spectra (emission, absorption) and thermodynamic properties (partition function, specific heat etc.) from molecular line lists. Input is taken in several formats, including ExoMol and HITRAN…

地球与行星天体物理 · 物理学 2018-06-27 Sergei N. Yurchenko , Ahmed Al-Refaie , Jonathan Tennyson

The upcoming Extremely Large Telescopes (ELTs) are expected to have the collecting area required to detect potential biosignature gases in the atmosphere of rocky planets around nearby low-mass stars. Some efforts are currently focusing on…

Fully relativistic calculations of radiative rates and electron impact excitation cross sections for Fe X are used to derive theoretical emission-line ratios involving transitions in the 174-366 A wavelength range. A comparison of these…

天体物理学 · 物理学 2009-11-13 F P Keenan , D B Jess , K M Aggarwal , R J Thomas , J W Brosius , J M Davila

The best-characterized exoplanets to date are planets on close-in transiting orbits around their host stars. The high level of irradiation and transiting geometry of these objects make them ideal targets for atmospheric investigations.…

地球与行星天体物理 · 物理学 2019-03-25 Diana Dragomir , Eliza Kempton , Jacob Bean , Ian Crossfield , Eric Gaidos , Nikole Lewis , Michael Line , Roxana Lupu , George Zhou

Observations of stellar surfaces - except for the Sun - are hampered by their tiny angular extent, while observed spectral lines are smeared by averaging over the stellar surface, and by stellar rotation. Exoplanet transits can be used to…

太阳与恒星天体物理 · 物理学 2016-12-07 Dainis Dravins , Hans-Günter Ludwig , Erik Dahlén , Hiva Pazira