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Young massive stars influence their surroundings from local to galactic scales, but the observational challenges associated with their distance and embedded nature has, until the recent decade, made high-resolution studies of these objects…

太阳与恒星天体物理 · 物理学 2021-10-27 A. J. Frost , R. D. Oudmaijer , S. L. Lumsden , W-J de Wit

We introduce a number of new theoretical approaches and improvements to the thermo-chemical disc modelling code ProDiMo to better predict and analyse the JWST line spectra of protoplanetary discs. We develop a new line escape probability…

地球与行星天体物理 · 物理学 2023-12-01 P. Woitke , W. -F. Thi , A. M. Arabhavi , I. Kamp , A. Kospal , P. Abraham

The detection of lines in emission in planetary atmospheres provides direct evidence of temperature inversion. We confirm the trend of ultra-hot Jupiters orbiting A-type stars showing temperature inversions on their daysides, by detecting…

The goal of the Protostellar Outflows at the EarliesT Stages (POETS) survey is to image the disk-outflow interface on scales of 10-100 au in a statistically significant sample (36) of luminous young stellar objects (YSO), targeting both the…

太阳与恒星天体物理 · 物理学 2019-10-23 Luca Moscadelli , Alberto Sanna , Ciriaco Goddi , Vasaant Krishnan , Fabrizio Massi , Francesca Bacciotti

There is a unique solution of the planet and star parameters from a planet transit light curve with two or more transits if the planet has a circular orbit and the light curve is observed in a band pass where limb darkening is negligible.…

天体物理学 · 物理学 2009-11-07 Sara Seager , Gabriela Mallen-Ornelas

VarStar Detect is a Python package available on PyPI optimized for the detection of variability inside photometric measurements. Based off of the Least Squares method of regression, VarStar Detect calculates the amplitude of a Fourier…

天体物理仪器与方法 · 物理学 2023-01-16 Jorge Perez Gonzalez , Nicolas Carrizosa Arias , Andres Cadenas Blanco

Context. Episodic accretion in young stellar objects (YSOs) is thought to play a critical role in addressing the "luminosity problem" associated with star formation. However, optical surveys tend to bias against sources that are heavily…

太阳与恒星天体物理 · 物理学 2026-04-22 Jiaxun Li , Tinggui Wang , Zheyu Lin

Since the '80s the \textit{Einstein} observatory has shown the Young Stellar Objects (YSOs), emit X-rays with luminosities, in the 0.3--8 keV bandpass, up to $\rm 10^3$--$\rm 10^4$ times than the Sun and that the X-ray emission is highly…

太阳与恒星天体物理 · 物理学 2023-04-05 Salvatore Sciortino

We characterize the molecular environment of candidate massive young stellar objects (MYSOs) signposted by methanol masers. Single pixel observations of 10 transitions of HCO^+, CO and CS isotopomers were carried out, using the IRAM 30m…

天体物理学 · 物理学 2009-11-13 M. Szymczak , A. Bartkiewicz , A. M. S. Richards

The VVV survey has allowed for an unprecedented number of multi-epoch observations of the southern Galactic plane. In a recent paper,13 massive young stellar objects(MYSOs) have already been identified within the highly variable(\Delta Ks >…

Kjeldsen et al. (1995, AJ 109, 1313; astro-ph/9411016) have developed a new technique for measuring stellar oscillations and claimed a detection in the G subgiant eta Boo. The technique involves monitoring temperature fluctuations in a star…

天体物理学 · 物理学 2015-06-24 T. R. Bedding , H. Kjeldsen , J. Reetz , B. Barbuy

The inner parts of the hot discs surrounding massive young stellar objects (MYSOs) are still barely explored due to observational limitations in terms of angular resolution, scarcity of diagnostic lines and the embedded and rare nature of…

星系天体物理 · 物理学 2024-10-09 E. Koumpia , D. Sun , M. Koutoulaki , J. D. Ilee , W. -J. de Wit , R. D. Oudmaijer , A. J. Frost

Crucial progress in our understanding of star formation and feedback will depend on the ability to obtain spatially resolved spectroscopic observations of \ion{H}{ii} regions, from which reliable instantaneous measurements of their physical…

Characterising stellar jet asymmetries is key to setting robust constraints on jet launching models and improving our understanding of the underlying mechanisms behind jet launching. We aim to characterise the asymmetric properties of the…

太阳与恒星天体物理 · 物理学 2024-12-11 A. Murphy , E. T. Whelan , F. Bacciotti , D. Coffey , F. Comerón , J. Eislöffel , B. Nisini , S. Antoniucci , J. M. Alcalá , T. P. Ray

$\gamma$-ray pulsar halos, most likely formed by inverse Compton scattering of electrons and positrons propagating in the pulsar-surrounding interstellar medium with background photons, serve as an ideal probe for Galactic cosmic-ray…

高能天体物理现象 · 物理学 2026-04-21 Kun Fang

We present new or improved methods for calculating NLTE, line-blanketed model atmospheres for hot stars with winds (spectral types A to O), with particular emphasis on a fast performance. These methods have been implemented into a previous,…

天体物理学 · 物理学 2009-11-10 J. Puls , M. A. Urbaneja , R. Venero , T. Repolust , U. Springmann , A. Jokuthy , M. R. Mokiem

We present Pandora, a new software to model, detect, and characterize transits of extrasolar planets with moons in stellar photometric time series. Pandora uses an analytical description of the transit light curve for both the planet and…

地球与行星天体物理 · 物理学 2022-05-20 Michael Hippke , René Heller

Near-infrared surveys of high-mass star-forming regions start to shed light onto their stellar content. A particular class of objects found in these regions, the so-called massive Young Stellar Objects (YSOs) are surrounded by dense…

天体物理学 · 物理学 2007-12-04 A. Bik , A. Lenorzer , W-. F. Thi , E. Puga-Antolin , L. B. F. M. Waters , L. Kaper , L. N. Martin-Hernandez

The availability of exquisite data and the development of new analysis techniques have enabled the study of emitting heights in proto-planetary disks. In this paper we introduce a simple model linking the emitting height of CO to the disk…