IFS ETC v1.3.4 About

Lazuli IFS Exoplanets

IFS Transit Spectroscopy beta

Transmission-spectrum simulator for a transiting planet observed with the IFS: per-transit depth precision, model-vs-flat S/N, light curves and the readout that keeps the host star below saturation.

Host star

Planet (fills star and planet from the NASA Exoplanet Archive)

Only confirmed transiting planets are listed. Values the archive lacks are estimated and flagged, or left blank for you to enter.

T_eff (K)

log g

[Fe/H]

R_* (R☉)

The host spectrum is a PHOENIX model at these parameters (2000–12000 K, log g 3.5–5.5, solar metallicity; T_eff and log g are clamped to the grid, a non-zero [Fe/H] uses the solar model).

Magnitude (AB or Vega)

Magnitude bandpass

Magnitude system

Planet

R_p (R_J)

M_p (M_J)

T_eq (K)

Transit duration (h)

Atmosphere

Scenario (fills the knobs below)

[M/H] (log, solar = 0)

C/O

μ (blank = chemistry)

Cloud deck log P (bar, blank = clear)

Haze log a (blank = none)

Haze slope

Isothermal H₂/He equilibrium-chemistry model with a gray cloud deck and power-law haze: a comparison model, not a tailored prediction.

Observation

Transits

Binned R

Noise seed

Errors scale as 1/√transits; photon + read noise only, no systematics floor or visit overheads.

Instrument

Instrument configuration

Spectrograph field

Frame readout

Jitter (mas)

Zodiacal background (V-band AB mag/arcsec²)

Readout (N groups : M frames : D drops)

Starts from slicersim’s default ramp and halves the groups until the host no longer saturates. Each ramp is repeated through the transit.

Result

-

No results yet. Type a planet name to fill the host star and planet from the archive (or enter them by hand), then click Calculate.

Configuration Summary

Planet

—

Host star

PHOENIX — K, log g —, [Fe/H] —, R_* — R☉

Brightness

— Vega (2MASS J)

Planet

R_p — R_J, M_p — M_J, T_eq — K, T₁₄ — h

Atmosphere

custom: [M/H] 0.0, C/O 0.55

Instrument

EOL, narrow field, Rapid subframe (0.7 s)

Jitter / zodi

10 mas / 22.5 mag

Readout

Auto (desaturate)

Engines

lazuli_exo v0.1.2 · slicersim v1.3.4

Up-the-ramp readout

One N:M:D ramp at frame resolution: every frame is a dot on the accumulating signal, dropped frames are hollow, each shaded band is a group and the bar in it is the averaged read slicersim fits through; the red mark is the reset.

No diagram yet. Run a calculation to see the readout.

Output results

No results yet. Run a calculation to see the transmission spectrum, light curves, diagnostics and the host-star spectrum.