VISIONS: the VISTA Star Formation Atlas

Meingast, S.; Alves, J.; Bouy, H.; Petr-Gotzens, M. G.; Fürnkranz, V.; Großschedl, J. E.; Hernandez, D.; Rottensteiner, A.; Ascenso, J.; Bayo, A.; Brändli, E.; A., Brown,; Forbrich, J.; Goodman, A.; Hacar, A.; Hasenberger, B.; Köhler, R.; Kubiak, K.; Kuhn, M.

doi:10.1051/0004-6361/202245771

Cited by 5 publications

(1 citation statement)

References 50 publications

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“…However, for a few sources the J flux is not detected. For these sources, we thus retrieve the photometry from UKIDSS, from the VISIONS survey (for Ophiuchus sources; Meingast et al 2023), from Gorlova et al (2010) (for Serpens sources), or from Haas et al (2008; for Corona Autralis sources), depending on the respective surveys' sky coverage. We use the extinction law from Cardelli et al (1989) to obtain the extinction in the K band, with a ratio of total to selective extinction R V of 5.…”

Section: Aqu Mm11mentioning

confidence: 99%

New Insights on the Accretion Properties of Class 0 Protostars from 2 μm Spectroscopy

Le Gouellec,

Greene,

Hillenbrand

et al. 2024

ApJ

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Sun-like stars are thought to accrete most of their final mass during the protostellar phase, during which the stellar embryo is surrounded by an infalling dense envelope. We present an analysis of 26 K-band spectra of Class 0 protostars, which are the youngest protostars. Of these, 18 are new observations made with the Keck MOSFIRE instrument. H i Brγ, several H2, and CO Δv = 2 features are detected and analyzed. We detect Brγ emission in 62%, CO overtone emission in 50%, and H2 emission in 90% of sources. The H i and CO emission is associated with accretion, while the H2 lines are consistent with shock excitation indicating jets/outflows. Six objects exhibit photospheric absorption features, with almost no outflow activity and no detection of the accretion-related Brγ emission line. Comparing these results with an archival sample of Class I K-band spectra, we find that the CO and Brγ emission lines are systematically more luminous in Class 0s, suggesting that the accretion is on average more vigorous in the Class 0 phase. Typically associated with the heated inner accretion disk, the much higher detection rate of CO overtone emission in Class 0s indicates also that episodes of high accretion activity are more frequent in Class 0 systems. The kinematics of the Class 0 CO overtone emission suggest either an accretion-heated inner disk or material directly infalling onto the central region. This could point toward an accretion mechanism of different nature in Class 0 systems than the typical picture of magnetospheric accretion.

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Section: Aqu Mm11mentioning

confidence: 99%

New Insights on the Accretion Properties of Class 0 Protostars from 2 μm Spectroscopy

Le Gouellec,

Greene,

Hillenbrand

et al. 2024

ApJ

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VISIONS: the VISTA Star Formation Atlas

Meingast¹,

Alves²,

Bouy³

et al. 2023

A&A

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VISIONS is an ESO public survey of five nearby (d < 500 pc) star-forming molecular cloud complexes that are canonically associated with the constellations of Chamaeleon, Corona Australis, Lupus, Ophiuchus, and Orion. The survey was carried out with the Visible and Infrared Survey Telescope for Astronomy (VISTA), using the VISTA Infrared Camera (VIRCAM), and collects data in the near-infrared passbands J (1.25 µm), H (1.65 µm), and K S (2.15 µm). With a total on-sky exposure time of 49.4 h VISIONS covers an area of 650 deg 2 , it is designed to build an infrared legacy archive with a structure and content similar to the Two Micron All Sky Survey (2MASS) for the screened star-forming regions. Taking place between April 2017 and March 2022, the observations yielded approximately 1.15 million images, which comprise 19 TB of raw data. The observations undertaken within the survey are grouped into three different subsurveys. First, the wide subsurvey comprises shallow, large-scale observations and it has revisited the star-forming complexes six times over the course of its execution. Second, the deep subsurvey of dedicated high-sensitivity observations has collected data on areas with the largest amounts of dust extinction. Third, the control subsurvey includes observations of areas of low-to-negligible dust extinction. Using this strategy, the VISIONS observation program offers multi-epoch position measurements, with the ability to access deeply embedded objects, and it provides a baseline for statistical comparisons and sample completeness -all at the same time. In particular, VISIONS is designed to measure the proper motions of point sources, with a precision of 1 mas yr −1 or better, when complemented with data from the VISTA Hemisphere Survey (VHS). In this way, VISIONS can provide proper motions of complete ensembles of embedded and low-mass objects, including sources inaccessible to the optical ESA Gaia mission. VISIONS will enable the community to address a variety of research topics from a more informed perspective, including the 3D distribution and motion of embedded stars and the nearby interstellar medium, the identification and characterization of young stellar objects, the formation and evolution of embedded stellar clusters and their initial mass function, as well as the characteristics of interstellar dust and the reddening law.

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VISIONS: the VISTA Star Formation Atlas

Meingast¹,

Bouy²,

Fürnkranz³

et al. 2023

A&A

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The VISIONS public survey provides large-scale, multi-epoch imaging of five nearby star-forming regions at sub-arcsecond resolution in the near-infrared. All data collected within the program and provided by the European Southern Observatory (ESO) science archive are processed with a custom end-to-end pipeline infrastructure to provide science-ready images and source catalogs. The data reduction environment has been specifically developed for the purpose of mitigating several shortcomings of the bona fide data products processed with software provided by the Cambridge Astronomical Survey Unit (CASU), such as spatially variable astrometric and photometric biases of up to 100 mas and 0.1 mag, respectively. At the same time, the resolution of co-added images is up to 20 % higher compared to the same products from the CASU processing environment. Most pipeline modules are written in Python and make extensive use of C extension libraries for numeric computations, thereby simultaneously providing accessibility, robustness, and high performance. The astrometric calibration is performed relative to the Gaia reference frame, and fluxes are calibrated with respect to the source magnitudes provided in the Two Micron All Sky Survey (2MASS). For bright sources, absolute astrometric errors are typically on the order of 10 to 15 mas and fluxes are determined with sub-percent precision. Moreover, the calibration with respect to 2MASS photometry is largely free of color terms. The pipeline produces data that are compliant with the ESO Phase 3 regulations and furthermore provides curated source catalogs that are structured similarly to those provided by the 2MASS survey.

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VISIONS: the VISTA Star Formation Atlas

Cited by 5 publications

References 50 publications

New Insights on the Accretion Properties of Class 0 Protostars from 2 μm Spectroscopy

New Insights on the Accretion Properties of Class 0 Protostars from 2 μm Spectroscopy

VISIONS: the VISTA Star Formation Atlas

VISIONS: the VISTA Star Formation Atlas

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