Is there a replacement for Times Roman that has Unicode math symbols and Greek letters?

Question

Another program (pandoc) is generating .tex files that are loaded with Unicode math symbols and Greek letters. I am successfully using those files with xelatex, but with the default fonts, it is hard to get math symbols and subscripts. The only "mainstream" serif font I have found that supports all these symbols is DejaVu Serif. But it looks very different from the Times New Roman that I have been using for all my other documents.

Is there another font, more closely approximating Times New Roman, that has extensive Unicode support? I have tried Tinos and Liberation Serif with no luck.

Here is a minimal non-working example:

\documentclass{article}
\usepackage{fontspec}
\setmainfont{STIX} % subscripts are missing
% \setmainfont{DejaVu Serif} % subscripts are present
\begin{document}
I want x₁ ↦ τ₂.
\end{document}

With STIX, I get the math symbol, but not the Unicode subscripts. What font can do both, and looks mostly like Times Roman?

Answer 1

STIX Two Math has (almost) full coverage for upright text; you can use it together with the STIX Two Text fonts.

\documentclass{article}
\usepackage{fontspec}

\setmainfont{STIX Two}[
  UprightFont={* Math},
  ItalicFont={* Text Italic},
  BoldFont={* Text Bold},
  BoldItalicFont={* Text Bold Italic},
]

\begin{document}

I want x₁ ↦ τ₂.

\textit{Italic τ₂}

\textbf{Bold τ₂}

\textbf{\textit{Bold Italic τ₂}}

\end{document}

Math specific characters are of course missing from the Text fonts.

Answer 2

Stix2 has separate text and math fonts, but the math font may be enough:

\documentclass{article}
\usepackage{fontspec}
%\setmainfont{STIX2Text-Regular.otf} 
\setmainfont{STIX2Math.otf} 

% \setmainfont{DejaVu Serif} % subscripts are present
\begin{document}
I want x₁ ↦ τ₂.
\end{document}