Herschel Orion Protostar Survey (HOPS), PI: Megeath
Data Set Characteristics
HOPS Overview HOPS Primary Data Access HOPS SEDs IRSA Catalog Search Tool: HOPS


The Herschel Orion Protostar Survey (HOPS, KPOT_tmegeath_2) is a sample of 410 young stellar objects (YSOs) in the Orion molecular clouds, selected from Spitzer data. Most objects have near-infrared photometry from 2MASS, mid- and far-infrared data from Spitzer and Herschel, and submillimeter photometry from APEX; thus, the SEDs cover 1.2 - 870 microns and are used to classify the sample into protostellar classes. Of the 410 YSOs, 330 have Spitzer and Herschel data and are mostly protostars; the remaining objects include likely extragalactic contaminants and faint YSOs. Using mid-IR spectral indices and bolometric temperatures, the sample of 330 YSOs is classified into 92 Class 0 protostars, 125 Class I protostars, 102 flat-spectrum sources, and 11 Class II pre-main-sequence stars. HOPS also implements a simple protostellar model (including a disk in an infalling envelope with outflow cavities) to generate a grid of 30,400 model SEDs and uses it to determine the best-fit model parameters for each protostar. If you use HOPS data, please cite Furlan et al. (2016).

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Data Set Characteristics

Data ProductDescriptionData Access
Images Spitzer/IRAC 3.6, 4.5, 5.8, 8 micron
Spitzer/MIPS 24 micron
Herschel/PACS 70, 100, 160 micron
Spectra Spitzer/IRS 5-38 micron
SED Data Catalog 2MASS JHK_s
Spitzer/IRAC 3.6, 4.5, 5.8, 8 micron
Spitzer/MIPS 24 micron
Herschel/PACS 70, 100, 160 micron
APEX 350, 870 micron
Spitzer/IRS 5.4-35 micron
SED Fits Catalog Best-fit parameters, including SED class, luminosity, temperature, disk radius, envelope mass, inclination angle, etc.
SED Models Tables of model fits to each HOPS YSO
HOPS ID Catalog ID, ra, dec for HOPS targets

HOPS Documentation

Data Delivery Document HOPS PACS README