A dataset provided by the European Space Agency

Name KPGT_golofs01_1
Title Stellar Disk Evolution
URL

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DOI https://doi.org/10.5270/esa-pkzl4xe
Author olofsson, g.
Description AbstractIn a collaboration between the HSC, P. Harvey (Mission Scientist)
and the three instrument consortia we propose to apply the full power
of Herschel to investigate the properties of circum-stellar disks.
The versatility of Herschel allows us to address several key questions:
How do the disks evolve with time?
Planets clearly form out of circum-stellar disks and there is growing
evidence that the time scale is short, 1 - 10 Myr, for the main accretion
phase. During this time period, the stellar radiation and stellar winds
clean the disks from most of their dust and gas, eventually making
them transparent. However, collisions and evaporation from comet-
like bodies will continue to produce dust and gas. This activity declines
with time, and we will pursue this scenario by observing a sample
of IR excess stars of known age, ranging from a few million years to
the age of the sun.
Are there analogues to our Kuiper belt around nearby stars?
The Kuiper belt is a dust belt surrounding the Sun, located outside
the orbit of Neptune, which has a key role in stabilizing orbits of
the KE-objects and this dynamical aspect makes it particularly
interesting to search for stars that may host KE-belt analogues.
Herschel offers a unique sensitivity beyond 100 m and we propose
an extensive survey of nearby stars seeking cold dust emission.
What will a closer IR look at the Fabulous Four
(and some other resolved disks) reveal?
Several nearby MS stars with IR excesses have circumstellar dust
structures that can be resolved by Herschel. Imaging these structures
in the six PACS+SPIRE bands will enable us to explore the dust
properties, notably the size distribution and albedo.
What is the composition of young disks?
We propose a detailed spectroscopic investigation of four bright
disks, including a full spectral scan with PACS,... an FTS scan at full
resolution and HIFI observations of selected frequencies.
The aim is to constrain the properties of both the dust and gas
components.
Publication Herschel-PACS observations of far-IR lines in young stellar objects. I. [OI] and H2O at 63 μm . Riviere-Marichalar P. et al. . Astronomy & Astrophysics, Volume 594, id.A59, 25 pp. . 594 . 10.1051\/0004-6361\/201527829 . 2016A&A...594A..59R ,
Stellar multiplicity and debris discs: an unbiased sample . Rodriguez David R. et al. . Monthly Notices of the Royal Astronomical Society, Volume 449, Issue 3, p.3160-3170 . 449 . 10.1093\/mnras\/stv483 . 2015MNRAS.449.3160R ,
Instrument HIFI_HifiPoint_fs, SPIRE_SpireSpectrometer_, PACS_PacsRangeSpec_point, SPIRE_SpirePhoto_large, PACS_PacsLineSpec_point, PACS_PacsPhoto_largeScan
Temporal Coverage 2009-12-10T20:21:55Z/2011-11-02T23:14:03Z
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 2012-05-02T22:53:06Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, olofsson, g., 2012, KPGT_golofs01_1, SPG v14.2.0, European Space Agency, https://doi.org/10.5270/esa-pkzl4xe