SPHEREx Ultracool Dwarf spectrophotometric Atlas (SUDA): Atmospheric and Fundamental Parameters of Ultracool Dwarfs

This archive contains the data products used for the SUDA analysis (Tu et al. 2026, submitted to ApJ). It includes the SPHEREx 102-channel spectrophotometric products for the final analysed sources, the empirical spectrophotometric atlas, the electronic source catalog, and the XGBoost model used to estimate bolometric luminosities for sources without parallaxes. Contents source_spectra/ Per-source 102-channel SPHEREx spectrophotometry in CSV format. File names use the source coordinate (J2000): RA_Dec.csv. atlas/ spectra/: empirical atlas spectra, one file per adopted (Teff, logg) bin. atlas_figure.pdf: PDF rendering of the atlas figure. catalog/suda_catalog.csv Full electronic catalog for the SUDA sources, see catalog/README.md for more details. model/ lbol_model.joblib: serialized XGBoost model pipeline for estimating log(Lbol/Lsun). SPHEREx 102-channel products The per-source CSV files include one row per nominal SPHEREx channel and contain spectrophotometry: wavelength_um: channel wavelength in microns. flux_ujy: flux density in micro-Jy. flux_err_ujy: flux-density uncertainty in micro-Jy. Empirical atlas products The atlas was constructed from sources with parallaxes by grouping the SPHEREx spectrophotometric measurements in bins of atmospheric-model Teff and evolutionary-model logg. The atlas contains 57 bins constructed from 986 spectrophotometric measurements. Each atlas spectrum contains: wave_um: wavelength in microns. normalized_flux: median normalized flux in the atlas bin. normalized_flux_err: uncertainty on the normalized flux estimate. n_contrib: number of contributing sources at that wavelength. XGBoost luminosity model The model predicts log(Lbol/Lsun) for sources without parallaxes using Teff, logg, and MH.本归档文件包含用于SUDA分析的全部数据产品（Tu等，2026年，投稿至《天体物理学杂志》(ApJ)），涵盖针对最终分析源的SPHEREx 102通道分光光度产品（SPHEREx）、经验分光光度星表、电子源目录，以及用于为无视差源估算热光度(Lbol)的XGBoost模型（XGBoost）。 目录内容 source_spectra/ 单源102通道SPHEREx分光光度数据，格式为逗号分隔值(CSV)。文件名采用源坐标（J2000.0历元）命名，格式为RA_Dec.csv。 atlas/ spectra/：经验星表光谱，每个采用的有效温度(Teff)与表面重力对数(logg)分箱对应一个文件。 atlas_figure.pdf：星表图表的PDF渲染文件。 catalog/suda_catalog.csv：SUDA源的完整电子目录，更多详情请参阅catalog/README.md。 model/ lbol_model.joblib：用于估算log(Lbol/Lsun)的序列化XGBoost模型流水线（XGBoost）。 SPHEREx 102通道产品（SPHEREx） 单源CSV文件中，每一行对应一个标称SPHEREx通道，包含以下分光光度数据： - wavelength_um：通道波长，单位为微米(μm) - flux_ujy：流量密度，单位为微央斯基(μJy) - flux_err_ujy：流量密度的不确定度，单位为微央斯基(μJy) 经验星表产品 本星表由带有视差的源构建而成：将SPHEREx分光光度测量数据按大气模型有效温度(Teff)与演化模型表面重力对数(logg)进行分箱分组。本星表共包含57个分箱，由986条分光光度测量数据构建而成。每条星表光谱包含以下信息： - wave_um：波长，单位为微米(μm) - normalized_flux：该星表分箱内的归一化流量中值 - normalized_flux_err：归一化流量估算值的不确定度 - n_contrib：该波长处的贡献源数量 XGBoost光度估算模型 本模型通过有效温度(Teff)、表面重力对数(logg)与金属丰度(MH)，为无视差的源估算log(Lbol/Lsun)。