There is growing evidence that the star formation process is in facthighly dynamic, on timescales from days to centuries. The temporalvariability is a new and powerful diagnostic tool to study Young StellarObjects (YSOs). Depending on the timescale of the variability in themid and farinfrared we can learn about different physical mechanismsshaping their structure and dynamics. Here we propose to extend ournear and midinfrared study of variable YSOs in the young open cluster IC 348 to the farinfrared (70 and 160 micron) using Herschel/PACS. We will constrain the frequency of farinfrared variability and compare the observed timedependent behavior with protostellar and disk models to understand its origin.Possible mechanisms include fluctuations in the accretion luminosity, orechoes of inner disk structural changes projected onto the infallingenvelope or flared outer disk surface. Our sample in IC348 covers a large part of the evolutionary sequence of YSOs from class I sources totransitional disks. The cadence of the requested observations allow us tostudy variations on time scales from days to months that could be extended to several years using our Spitzer/MIPS data.
Publication
The (w)hole survey: An unbiased sample study of transition disk candidates based on Spitzer catalogs | van der Marel N. et al. | Astronomy & Astrophysics Volume 592 id.A126 36 pp. | 592 | 10.1051\\/0004-6361\\/201628075 | 2016A&A...592A.126V | http://adsabs.harvard.edu/abs/2016A%26A...592A.126V
The Extraordinary Far-infrared Variation of a Protostar: Herschel/PACS Observations of LRLL54361 | Balog Zoltan et al. | The Astrophysical Journal Letters Volume 789 Issue 2 article id. L38 5 pp. (2014). | 789 | 10.1088\\/2041-8205\\/789\\/2\\/L38 | 2014ApJ...789L..38B | http://adsabs.harvard.edu/abs/2014ApJ...789L..38B
Catalog of High Protostellar Surface Density Regions in Nearby Embedded Clusters | Li Juan et al. | The Astrophysical Journal Volume 871 Issue 2 article id. 163 18 pp. (2019). | 871 | 10.3847\\/1538-4357\\/aaf652 | 2019ApJ...871..163L | http://adsabs.harvard.edu/abs/2019ApJ...871..163L
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 | http://adsabs.harvard.edu/abs/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 | http://adsabs.harvard.edu/abs/2019AJ....157...12B
IC 348-SMM2E: a Class 0 proto-brown dwarf candidate forming as a scaled-down version of low-mass stars | Palau Aina et al. | Monthly Notices of the Royal Astronomical Society Volume 444 Issue 1 p.833-845 | 444 | 10.1093\\/mnras\\/stu1461 | 2014MNRAS.444..833P | http://adsabs.harvard.edu/abs/2014MNRAS.444..833P
Instrument
PACS_PacsPhoto_largeScan
Temporal Coverage
2012-02-08T08:55:18Z/2012-03-20T13:36:52Z
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.
European Space Agency, balog et al., 2012, 'Multiepoch observations of IC 348: Using Far-Infrared Variability to Constrain the\nDust Structure in Young Stellar Objects', SPG v14.2.0, European Space Agency, https://doi.org/10.5270/esa-87ufdv3
