A dataset provided by the European Space Agency

Name OT1_hmaness_1
Title Planets, Debris Disks, and the Lambda Bootis Stars
URL

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http://archives.esac.esa.int/hsa/whsa-tap-server/data?retrieval_type=OBSERVATION&observation_id=1342242079&instrument_name=PACS&product_level=LEVEL0&compress=true

DOI https://doi.org/10.5270/esa-ucnmwg7
Author maness, h.
Description We propose to explore the link between lambda Bootis stars, debris
disks, and planetesimal formation and evolution. The lambda Boo stars
are a rare type of peculiar A star (2%), which are Population 1 and
metal poor. Planet bearing systems and debris disk stars appear
unusually well represented in the lambda Boo class: for example, beta
Pic, Vega, and HR 8799 are all lambda Boo candidates.

A small sample of 14 lambda Boo stars observed by Spitzer suggests an
occurrence of infrared excess approaching 100%. Only two lambda Boo
stars are included in the DEBRIS/DUNES Herschel key program debris
disk surveys. We will use PACS/Herschel to make sensitive,
high-resolution maps of 27 new lambda Boo stars. Like DEBRIS/DUNES,
we will reach the stellar photosphere for all targets, enabling a
measurement of the true rate of excess infrared emission among lambda
Boo stars compared to normal A stars.

The depletion pattern of heavy elements in the atmospheres of lambda
Boo stars suggests they may have accreted gas from which dust grains
have condensed and been removed: this gas may be circumstellar gas
that has formed planetesimals or dusty interstellar gas. While the
circumstellar disk scenario predicts sizes of a few hundred AU, the
cloud accretion scenario predicts 1000-2000 AU bow structures oriented
in the direction of the relative motion of the cloud and star. With
target distances of < 140 pc, these bow structures are expected to be
resolved for all targets. These will be the first mid-infrared
observations of lambda Boo stars outside of the low density Local
Bubble: if interstellar medium interactions dominate the lambda Boo
phenomenon then systematic variations in excess strength and
morphology may occur with distance.
Publication
  • IR excesses around nearby Lambda Boo stars are caused by debris discs rather than ISM bow waves | Draper Z. H. et al. | Monthly Notices of the Royal Astronomical Society Volume 456 Issue 1 p.459-476 | 456 | 10.1093\\/mnras\\/stv2696 | 2016MNRAS.456..459D | http://adsabs.harvard.edu/abs/2016MNRAS.456..459D
Instrument PACS_PacsPhoto_largeScan
Temporal Coverage 2011-07-11T23:46:31Z/2012-03-20T19:22:42Z
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 2012-09-20T18:21:42Z
Keywords Herschel, HSC, submillimetre, far-infrared, HIFI, PACS, SPIRE
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, maness et al., 2012, 'Planets, Debris Disks, and the Lambda Bootis Stars', SPG v14.2.0, European Space Agency, https://doi.org/10.5270/esa-ucnmwg7