"The author writes novels on the computer."
Translation:Scríobhann an t-údar úrscéalta ar an ríomhaire.
Yes. It's there because údar is a masculine noun. When masculine nouns beginning with a vowel follow an you need the <t-> (or <t> if it's capitalized)
Does anyone know the etymology of úrscéal? I see that 'scéal' (story) is part of the word, which makes sense, but I'm having trouble figuring out 'úr' - I found the definition of 'fresh or new,' so does the word úrscéalta mean a 'new story' in the sense that it's a fictional story?