EXOhSPEC home

Scientific evidence

Public EXOhSPEC measurements.

EXOhSPEC supports radial-velocity measurement, stellar spectroscopy, fibre studies and calibration research. The examples below are drawn from the public programme site and publication record.

First-light lunar spectrum recorded by EXOhSPEC
First-light lunar spectrum · observed through thick cloud
01 / On-sky evidence

Demonstrated measurements

Examples from the public programme record.

These are the three measurement examples shown on the official EXOhSPEC programme site.

Radial velocity

τ Boötis

EXOhSPEC measurements shown against a reference curve generated using DACE.

Stellar magnetism

Sun and sunspots

Magnetically sensitive lines show broader profiles at higher effective Landé factor.

First light

Lunar spectrum

An early end-to-end spectrum of the Moon, recorded through thick cloud.

02 / Evidence reading

From detector frame to scientific statement

Public examples are evidence products, not isolated pictures.

Each result sits inside an acquisition and reduction chain. The level of inference must match the data product that is actually shown.

  1. 01

    Observing context

    Target, telescope or laboratory source, date, fibre injection and atmospheric conditions.

  2. 02

    Detector record

    Cross-dispersed orders, exposure settings, detector state and instrumental background.

  3. 03

    Reduction and calibration

    Order tracing, extraction, wavelength reference and quality-control decisions.

  4. 04

    Measured observable

    Line profile, centroid, wavelength shift or radial-velocity estimate with its stated method.

  5. 05

    Scientific interpretation

    A conclusion bounded by uncertainty, comparison data and the tested instrument configuration.

Public evidence

What these examples establish

The programme has recorded astronomical and solar spectra and has demonstrated connected acquisition, reduction and instrument- science workflows.

Interpretation limit

What they do not establish alone

A displayed spectrum or radial-velocity plot does not by itself define current commissioning status, repeatability, uncertainty or the performance of a different EXOhSPEC configuration.

03 / Research threads

Instrument science

Published instrument-science topics.

Published

Fibre transmission and modal noise

Tapered fibres, graded-index propagation and galvanometer agitation address illumination changes that can limit precise spectroscopy.

Published

Broad-band calibration

A solid fused-silica metalon with broad-band metallic coatings extends the programme’s wavelength-calibration research.

Published

Active instrument control

Centroid measurements and piezo adjustment are used to monitor and correct spectral-line position.

Read the paper

Peer-reviewed record

Methods and instrument papers

The publication page brings together the folded-design, mechanical, reduction, active-control, fibre and calibration strands.

View publications