A dynamic database of(currently 534834 2010-Jun-18)

molecular model spectra for astronomers

Jan CamiAndrew Markwick

1000–0110 and 1110 − 0220

Same thing at ~ same time

<< data analysis >>

(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 thin Optically 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 spectraii) obtain first order estimates of temperature and column density from those features

perfectblack box

All possible molecular species What’s available

All possible transitions What’s available

Full non-LTE radiative transfer Isotherm, LTE

Various geometries Slab

All possible instruments On request

sf

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

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39 molecules, 96 isotopologues

69 temperatures (10 – 2500 K)

101 column densities (1014 – 1024 cm-2)

10 instrument profiles ( = spectral resolutions)

534834 spectra, 0.3 – 3000 micron (100 GHz – 1 PHz)

Spitzer-IRS LowRes1, LowRes2, HiResISO-SWS AOT1, speed1; IRTF-SpeXVLT-ISAAC LW MedRes, VLT-CRIRESHerschel-SPIRE, Herschel-PACSGemini-Phoenix

10 instrument profiles ( ~ spectral resolutions)

Spitzer-IRS LowRes1 90Spitzer-IRS LowRes2 120Spitzer-IRS HiRes 600ISO-SWS AOT1, speed1 300IRTF-SpeX 2000VLT-ISAAC LW MedRes 10000VLT-CRIRES 100000Herschel-SPIRE 1000Herschel-PACS 1500Gemini-Phoenix 65000

Of course, none of this is possible without the line lists

3,584,261 HITRAN04/08 (Rothman et al.) multiple

3,147,603 CDSD (Tashkun et al.) CO2

279,028,856 Partridge & Schwenke H2O

~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 atmosphereline lists available at 296 K (HITRAN)

often infrared

7 molecules with “warm” line lists (that we have)H2O, OH, TiO, SiO, SiS, CO, CO2

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!