| Name | OT1_nbillot_1 |
| Title | HYSOVAR: Circumstellar Disks Variability around Young Stellar Objects in the Orion Nebula Cluster with Herschel/PACS |
| URL | http://archives.esac.esa.int/hsa/whsa-tap-server/data?retrieval_type=OBSERVATION&observation_id=1342215726&instrument_name=PACS&product_level=LEVEL0&compress=true |
| DOI | https://doi.org/10.5270/esa-g6np211 |
| Author | European Space Agency |
| Description | The variability of Young Stellar Objects (YSOs) have been demonstrated over half a century ago from optical observations. More recent time series photometry of YSOs in the thermal infrared have shown their great potential to probe the structure of inner circumstellar disks (r << 1 AU), in particular the presence of warps and .clouds. in the disks which may owe their existence to the gravitational torques from close-in planets. For instance the YSOVAR program used the Spitzer IRAC instrument to monitor over 1400virgulYSOs and establish that 70% of them show significant variability in the mid-IR. Today the Herschel/PACS spectral coverage, sensitivity and stability offer a unique opportunity to access the wavelength regime sensitive to the dust thermal emission from the terrestrial habitable zone through the ice-line where gas giants are expected to form. We propose the HYSOVAR program, an expansion of YSOVAR with the Herschel/PACS Photometer, to monitor the flux variations of 100+ Class I YSOs in Orion over weeks-to-years time scales. This small (9.9 hours) exploratory program would greatly increase the statistics and sensitivity of previous studies in the far-IR, and it would help us identify the physical processes responsible for the observed infrared variability by placing strong constraints on existing models of star and planet formation. |
| Publication | Hops 383: an Outbursting Class 0 Protostar in Orion . Safron Emily J. et al. . The Astrophysical Journal Letters, Volume 800, Issue 1, article id. L5, 6 pp. (2015). . 800 . 10.1088\/2041-8205\/800\/1\/L5 . 2015ApJ...800L...5S , 3D dynamics of the Orion cloud complex. Discovery of coherent radial gas motions at the 100-pc scale . Großschedl Josefa E. et al. . Astronomy and Astrophysics . null . null . 2021A&A...647A..91G , A Search for Very Low-luminosity Objects in Gould Belt Clouds . Kim Mi-Ryang et al. . The Astrophysical Journal Supplement Series, Volume 225, Issue 2, article id. 26, 17 pp. (2016). . 225 . 10.3847\/0067-0049\/225\/2\/26 . 2016ApJS..225...26K , A Multi-band Catalog of 10978 Star Clusters, Associations, and Candidates in the Milky Way . Bica Eduardo et al. . The Astronomical Journal, Volume 157, Issue 1, article id. 12, 14 pp. (2019). . 157 . 10.3847\/1538-3881\/aaef8d . 2019AJ....157...12B , Velocity-resolved [CII] Emission and [CII]/FIR Mapping along Orion with Herschel . Goicoechea Javier R. et al. . The Astrophysical Journal, Volume 812, Issue 1, article id. 75, 21 pp. (2015). . 812 . 10.1088\/0004-637X\/812\/1\/75 . 2015ApJ...812...75G , Herschel Far-infrared Photometric Monitoring of Protostars in the Orion Nebula Cluster . Billot N. et al. . The Astrophysical Journal Letters, Volume 753, Issue 2, article id. L35, 8 pp. (2012). . 753 . 10.1088\/2041-8205\/753\/2\/L35 . 2012ApJ...753L..35B , Nano-grain depletion in photon-dominated regions . Schirmer T. et al. . Astronomy and Astrophysics . null . null . 2022A&A...666A..49S , |
| Instrument | PACS_PacsPhoto_largeScan |
| Temporal Coverage | 2011-02-25T23:57:13Z/2012-08-27T16:53:57Z |
| Version | SPG v14.2.0 |
| Mission Description | Herschel was launched on 14 May 2009! It is the fourth 'cornerstone' mission in the ESA science programme. With a 3.5 m Cassegrain telescope it is the largest space telescope ever launched. It is performing photometry and spectroscopy in approximately the 55-671 µm range, bridging the gap between earlier infrared space missions and groundbased facilities. |
| Creator Contact | https://support.cosmos.esa.int/h®erschel/ |
| Date Published | 2013-02-27T16:30:56Z |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, 2013, Hysovar: Circumstellar Disks Variability Around Young Stellar Objects In The Orion Nebula Cluster With Herschel/Pacs, SPG v14.2.0, European Space Agency, https://doi.org/10.5270/esa-g6np211 |