A dynamic database of (currently 534834 2010-Jun-18) molecular model spectra for astronomers Jan Cami Andrew Markwick.

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Presentation transcript:

A dynamic database of (currently Jun-18) molecular model spectra for astronomers Jan Cami Andrew Markwick

10 0 0– and − Same thing at ~ same time

> (Identify molecular species) Find & understand (!) line list Astronomical model: parameters? Radiative Transfer Convolve with instrumental profile Fit spectrum: determine parameters

g Her

BU And

Mira

Modeling results Optically thinOptically thick

HR 4049 : CO2

Grains in meteorite

In astronomy, finding parameters to within an order of magnitude is often good enough (models often necessarily simplified) ! Sometimes we don’t really care about the parameters – we just want to know the spectral signature. Applicable to many different astronomical observations!

The goal: To help people to: i)identify features in spectra ii) obtain first order estimates of temperature and column density from those features

perfect black box All possible molecular speciesWhat’s available All possible transitionsWhat’s available Full non-LTE radiative transfer Isotherm, LTE Various geometriesSlab All possible instruments On request sfsf

> Search Compare Download Request

View > Compare Download Request

View Search > Download Request

View Search > Download Request

View Search Compare > Request

** in the download you also get the emission spectrum!

View Search Compare Download >

For the interested… PHP/MySQL XML files on server Flash graph Javascript / Actionscript gateway UWO (calculations) UoM (service) currently ~ minutes Stats for v2… 70 registered users ~ few hundred ‘actions’ per month so far

39 molecules, 96 isotopologues 69 temperatures (10 – 2500 K) 101 column densities (10 14 – cm -2 ) 10 instrument profiles ( = spectral resolutions) spectra, 0.3 – 3000 micron (100 GHz – 1 PHz) Spitzer-IRS LowRes1, LowRes2, HiRes ISO-SWS AOT1, speed1; IRTF-SpeX VLT-ISAAC LW MedRes, VLT-CRIRES Herschel-SPIRE, Herschel-PACS Gemini-Phoenix

10 instrument profiles ( ~ spectral resolutions) Spitzer-IRS LowRes190 Spitzer-IRS LowRes2120 Spitzer-IRS HiRes600 ISO-SWS AOT1, speed1300 IRTF-SpeX2000 VLT-ISAAC LW MedRes10000 VLT-CRIRES Herschel-SPIRE1000 Herschel-PACS1500 Gemini-Phoenix65000

Of course, none of this is possible without the line lists 3,584,261HITRAN04/08 (Rothman et al.) multiple 6,003,542HITEMP (Rothman et al.) CO, CO 2, H 2 O 3,147,603CDSD (Tashkun et al.) CO 2 279,028,856Partridge & Schwenke H 2 O ~100m Schwenke TiO 39,900 Goldman et al. OH 134,421 Goorvitch CO 93,372 Langhoff & Bauschlicher SiO 31,590 Cami, Bauschlicher, Markwick et al.SiS

~ 142 molecules detected in space ~ 212 including isotopologues 42 molecules studied in earth atmosphere line lists available at 296 K (HITRAN) often infrared 7 molecules with “warm” line lists (that we have) H 2 O, OH, TiO, SiO, SiS, CO, CO 2 Large frequency range Many levels (electronic, vibrational, rotational) High temperatures

63 Carbon star chemistry

Astronomers wish list: - More species (carbon)! - Higher temperatures/weak lines? - Partition functions!