# Project 1640 Observations of the White Dwarf HD 114174 B

## TL;DR

This paper presents the first near-infrared spectrum of the white dwarf HD 114174 B, providing insights into its temperature, mass, and possible surrounding debris or brown dwarf, using combined spectroscopic and imaging data.

## Contribution

First near-infrared spectrum of HD 114174 B enabling new constraints on its physical properties and orbital parameters.

## Key findings

- Possible cool, low-mass white dwarf with Teff ~ 3800 K
- Alternative high-mass white dwarf with Teff > 6000 K and potential infra-red excess
- Constraints on orbital parameters from combined imaging and RV data

## Abstract

We present the first near infra-red spectrum of the faint white dwarf companion HD 114174 B, obtained with Project 1640. Our spectrum, covering the Y, J and H bands, combined with previous TRENDS photometry measurements, allows us to place further constraints on this companion. We suggest two possible scenarios; either this object is an old, low mass, cool H atmosphere white dwarf with Teff ~ 3800 K or a high mass white dwarf with Teff > 6000 K, potentially with an associated cool (Teff ~ 700 K) brown dwarf or debris disk resulting in an infra-red excess in the L band. We also provide an additional astrometry point for 2014 June 12 and use the modelled companion mass combined with the RV and direct imaging data to place constraints on the orbital parameters for this companion.