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(Abridged) We performed a deep infrared imaging survey of 63 embedded young stellar objects (YSOs) located in the Taurus and Ophiuchus clouds to search for companions. The sample includes Class I and flat infrared spectrum protostellar…

Astrophysics · Physics 2009-11-10 G. Duchene , J. Bouvier , S. Bontemps , P. Andre , F. Motte

The first results from a VLT-ISAAC program on L- and M-band infrared spectroscopy of deeply-embedded young stellar objects are presented. The advent of 8-m class telescopes allows high S/N spectra of low-luminosity sources to be obtained.…

The properties of accretion disks around stars and brown dwarfs in the SOri cluster (age 3 Myr) are studied based on NIR time series photometry supported by MIR spectral energy distributions. We monitor ~30 young low-mass sources over 8…

Solar and Stellar Astrophysics · Physics 2015-05-13 Alexander Scholz , Xiaoying Xu , Ray Jayawardhana , Kenneth Wood , Jochen Eisloeffel , Ciara Quinn

More than a thousand warm debris disks have been detected as infrared excess at mid-infrared wavelengths, and their frequencies have been obtained for various spectral types of stars. However, the dependence of the frequencies on spectral…

Earth and Planetary Astrophysics · Physics 2024-04-08 Toshiyuki Mizuki , Munetake Momose , Masataka Aizawa , Hiroshi Kobayashi

The mid-infrared properties of pre-planetary disks are sensitive to the temperature and flaring profiles of disks for the regions where planet formation is expected to occur. In order to constrain theories of planet formation, we have…

Solar and Stellar Astrophysics · Physics 2009-07-22 J. D. Monnier , P. G. Tuthill , M. Ireland , R. Cohen , A. Tannirkulam , M. D. Perrin

We present a sample of low-resolution 5-38um Spitzer IRS spectra of the inner few square kiloparsecs of 59 nearby galaxies spanning a large range of star formation properties. A robust method for decomposing mid-infrared galaxy spectra is…

We discuss VLTI AMBER and MIDI interferometry in addition to single-dish Subaru observations of massive young stellar objects. The observations probe linear size scales between 10 to 1000 AU for the average distance of our sources.

Solar and Stellar Astrophysics · Physics 2009-05-06 W. J. de Wit , M. G. Hoare , R. D. Oudmaijer , T. Fujiyoshi

We present an analysis of 288 young stellar objects (YSOs) in the Perseus Molecular Cloud that have well defined $g$ and $r$-band lightcurves from the Zwicky Transient Facility. Of the 288 YSOs, 238 sources (83% of our working sample) are…

Solar and Stellar Astrophysics · Physics 2023-06-28 Xiao-Long Wang , Min Fang , Gregory J. Herczeg , Yu Gao , Hai-Jun Tian , Xing-Yu Zhou , Hong-Xin Zhang , Xue-Peng Chen

We present a K-band atlas of 106 reflection nebulae, 41 of which are new discoveries. We observed these nebulae with the UH 2.2 m telescope in the course of an imaging survey of 197 objects that were selected to be nearby young Class I…

Astrophysics · Physics 2008-11-26 Michael S. Connelley , Bo Reipurth , Alan T. Tokunaga

The young massive stellar object G35.20-0.74 was observed in the mid-infrared using T-ReCS on Gemini South. Previous observations have shown that the near infrared emission has a fan-like morphology that is consistent with emission from the…

Astrophysics · Physics 2009-11-11 James M. De Buizer

We have identified 230 Tycho-2 Spectral Catalog stars that exhibit 8 micron mid-infrared extraphotospheric excesses in the MidCourse Space Experiment (MSX) and Spitzer Space Telescope Galactic Legacy MidPlane Survey Extraordinaire (GLIMPSE)…

We present mid-infrared spectroscopy of a sample of 16 optically faint infrared luminous galaxies obtained with the Infrared Spectrograph (IRS) on the Spitzer Space Telescope. These sources were jointly selected from Spitzer and Chandra…

We present low-resolution 5.5-35 um spectra for 103 galaxies from the 12 um Seyfert sample, a complete unbiased 12 um flux limited sample of local Seyfert galaxies selected from the IRAS Faint Source Catalog, obtained with the Infrared…

Cosmology and Nongalactic Astrophysics · Physics 2009-08-05 Yanling Wu , Vassilis Charmandaris , Jiasheng Huang , Luigi Spinoglio , Silvia Tommasin

This paper discusses evidence for and properties of disks associated to brown dwarfs in the star-forming region rho-Oph. We selected nine objects fr om the ISOCAM survey of Bontemps et al. (2001) that have detections in the two mid-infrared…

Astrophysics · Physics 2009-11-07 A. Natta , L. Testi , F. Comeron , E. Oliva , F. D'Antona , C. Baffa , G. Comoretto , S. Gennari

General results from a 3-5 micron spectroscopic survey of nearby low-mass young stellar objects are presented. L and M-band spectra have been obtained of \~50 low mass embedded young stars using the ISAAC spectrometer mounted on UT1-Antu at…

Astrophysics · Physics 2007-05-23 K. M. Pontoppidan , H. Fraser , F. L. Schoeier , E. Dartois , W. -F. Thi , E. F. van Dishoeck

We present maps of dust emission at 7 microns and 15 microns/7 microns intensity ratios of selected regions in 43 spiral galaxies observed with ISOCAM. This atlas is a complement to studies based on these observations, dealing with star…

Astrophysics · Physics 2009-11-06 H. Roussel , L. Vigroux , A. Bosma , M. Sauvage , C. Bonoli , P. Gallais , T. Hawarden , J. Lequeux , S. Madden , P. Mazzei

This paper presents a catalog of the energy distribution in the spectra of 263 stars in the wavelength range from 0.4 to 100 {\mu}m, which are at late stages of evolution and have been observed by the ISO space observatory. For each object…

Solar and Stellar Astrophysics · Physics 2024-09-10 A. M. Tatarnikov , S. G. Zheltoukhov , E. D. Malik

The formation scenario for massive stars is still under discussion. To further constrain current theories, it is vital to spatially resolve the structures from which material accretes onto massive young stellar objects (MYSOs). Due to the…

Solar and Stellar Astrophysics · Physics 2015-05-19 R. Follert , H. Linz , B. Stecklum , R. van Boekel , Th. Henning , M. Feldt , T. M. Herbst , Ch. Leinert

Context: Extended circumstellar emission has been detected within a few 100 milli-arcsec around > 10% of nearby main sequence stars using near-infrared interferometry. Follow-up observations using other techniques, should they yield similar…

Spectra have been obtained with the low-resolution modules of the Infrared Spectrograph (IRS) on the Spitzer Space Telescope (Spitzer) for 58 sources having f$_{\nu}$(24 micron) > 0.75 mJy. Sources were chosen from a survey of 8.2 deg$^{2}$…